Matt Lauer(01 of114)
Open Image ModalMatt Lauer dresses as Pam Anderson's character from "Baywatch" on NBC's "Today" Halloween show on Thursday, Oct. 31, 2013 in New York. (credit:Charles Sykes/Invision/AP)
Sandra Bullock & Melissa McCarthy(02 of114)
Open Image ModalIt's hard to recognize these actresses with their fishermen costumes. (credit:FameFlyNet)
Paris Hilton(03 of114)
Open Image ModalParis Hilton as Miley Cyrus Halloween at the Roosevelt Hotel in Hollywood, California on October 26, 2013. (credit:FameFlyNet)
Kenan Thompson(04 of114)
Open Image ModalHost Kenan Thompson speaks on stage at "Hub Network's First Annual Halloween Bash" on Sunday, Oct. 20, 2013, at the Barker Hanger in Santa Monica, Calif. The star-studded special will be broadcasted on the Hub Network on Saturday Oct. 26, 2013. (Photo by Jordan Strauss/Invision for the Hub Network/AP Images) (credit:Invision for the Hub Network)
Kathie Lee Gifford & Hoda Kotb(05 of114)
Open Image ModalKathie Lee Gifford, left, and Hoda Kotb dress as Wilma and Betty from the "Flintstones" on NBC's "Today" Halloween show on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP) (credit:Charles Sykes/Invision/AP)
Lily Allen(06 of114)
Open Image ModalLily Allen is seen leaving the UNICEF Halloween ball, held at 1 Mayfair on October 31, 2013 in London, England. (Photo by Niki Nikolova/FilmMagic) (credit:Niki Nikolova via Getty Images)
Derek Hough(07 of114)
Open Image ModalDerek Hough attends Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, Oct. 31, 2013 in Los Angeles. (Photo by Todd Williamson/Invision for Jose Cuervo/AP Images) (credit:Invision for Jose Cuervo)
Paris Hilton(08 of114)
Open Image ModalParis Hilton attends Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, October 31, 2013 in Los Angeles. (credit:Todd Williamson/Invision/AP)
Gwen Stefani(09 of114)
Open Image ModalGwen Stefanie was a pretty princess for Halloween 2013. (credit:FameFlyNet)
Coco Austin & Ice T(10 of114)
Open Image ModalCoco Austin and Ice T attend Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP) (credit:Charles Sykes/Invision/AP)
Miley Cyrus(11 of114)
Open Image ModalMiley Cyrus as Lil Kim at the 1999 VMAs. (credit:Miley Cyrus/Twitter)
Snooki & JWoww(12 of114)
Open Image ModalJenni "JWoww" Farley, left, and Nicole "Snooki" Polizzi attend Night of the Living Drag: A RuPaul's Drag Race Halloween party on Friday, Oct. 25, 2013 in New York. (Photo by Charles Sykes/Invision/AP) (credit:Charles Sykes/Invision/AP)
Demi Lovato(13 of114)
Open Image ModalWEST HOLLYWOOD, CA - OCTOBER 31: Singer/actress Demi Lovato attends her Halloween Party at the PhilyMack Management Building on October 31, 2013 in West Hollywood, California. (Photo by Christopher Polk/Getty Images for Philymack) (credit:Christopher Polk via Getty Images)
Miranda Kerr(14 of114)
Open Image ModalNEW YORK, NY - OCTOBER 31: Miranda Kerr hosts the Sexy Circus Halloween Party at Catch Rooftop on October 31, 2011 in New York City. (Photo by Jerritt Clark/WireImage) (credit:Jerritt Clark via Getty Images)
Beyonce(15 of114)
Open Image ModalBeyonce as an angel. (credit:Beyonce/Instagram)
Billy Gardell & Melissa McCarthy(16 of114)
Open Image ModalBilly Gardell as Frankenstein and Melissa McCarthy as bride of Frankenstein. (credit:CBS Photo Archive via Getty Images)
Naya Rivera(17 of114)
Open Image ModalNaya Rivera as Carmen Sandiego. (credit:Naya Rivera/Instagram)
Nick Cannon & Mariah Carey(18 of114)
Open Image ModalNEW YORK - OCTOBER 30: Nick Cannon and Mariah Carey attend a Halloween party at Marquee on October 30, 2008 in New York City. (Photo by Johnny Nunez/WireImage) (credit:Johnny Nunez via Getty Images)
Rumer Willis(19 of114)
Open Image ModalRumer Willis as a leopard. (credit:Rumer Willis/Instagram)
Perez Hilton(20 of114)
Open Image ModalPerez Hilton attends Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP) (credit:Charles Sykes/Invision/AP)
Gisele Bündchen & Tom Brady(21 of114)
Open Image ModalGisele Bündchen and Tom Brady as Dorothy and the Lion from "The Wizard of Oz." (credit:Gisele Bündchen/Instagram)
Kim Kardashian(22 of114)
Open Image ModalKim Kardashian, dressed in a Little Red Riding Hood costume, arrives at Heidi Klumâs Halloween Party in New York, Sunday, Oct. 31, 2010. (AP Photo/Charles Sykes) (credit:ASSOCIATED PRESS)
Austin Nichols & Sophia Bush(23 of114)
Open Image ModalActors Austin Nichols and Sophia Bush attend Maroon 5's Halloween Bash presented by Bacardi at Hollywood Forever Cemetery on October 31, 2010 in Hollywood, California. (credit:Charley Gallay via Getty Images)
Shenae Grimes(24 of114)
Open Image ModalLOS ANGELES, CA - OCTOBER 28: 90210 starlet, Shenae Grimes, dressed as Monster High's Frankie Stein, leaves for Matthew Morrison's 3rd Annual Halloween Party on October 28, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Mattel) (credit:Christopher Polk via Getty Images)
Ellen DeGeneres(25 of114)
Open Image ModalEllen DeGeneres as Nicki Minaj. (credit:Ellen DeGeneres/Twitter)
Neil Patrick Harris & David Burtka(26 of114)
Open Image ModalNeil Patrick Harris and David Burtka as Tweedle Dee and Tweedle Dum and their twins Harper and Gideon as Alice and the White Rabbit. (credit:Neil Patrick Harris/Instagram)
Lauren Conrad(27 of114)
Open Image ModalLauren Conrad arrives for the Pur Jeans Halloween Bash in Los Angeles, Friday, Oct. 31, 2008. (AP Photo/Chris Pizzello) (credit:ASSOCIATED PRESS)
Kelly Osbourne(28 of114)
Open Image ModalKelly Osbourne as Dame Edna. (credit:Kelly Osbourne/Instagram)
Christina Aguilera & Jordan Bratman(29 of114)
Open Image ModalChristina Aguilera and Jordan Bratman (Photo by Denise Truscello/WireImage) (credit:Denise Truscello via Getty Images)
Jay Manuel(30 of114)
Open Image ModalJay Manuel attends Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP) (credit:Charles Sykes/Invision/AP)
Demi Lovato(31 of114)
Open Image ModalDemi Lovato as a skeleton. (credit:Demi Lovato/Twitter)
Miley Cyrus(32 of114)
Open Image ModalMiley Cyrus as Nicki Minaj. (credit:Miley Cyrus/Twitter)
Kelly Osbourne(33 of114)
Open Image ModalKelly Osbourne as Christina Hendricks. (credit:Kelly Osbourne/Instagram)
Jennifer Lopez & Casper Smart(34 of114)
Open Image ModalJennifer Lopez & Casper Smart as hippies. (credit:JenniferLopez.com)
Nick Cannon & Mariah Carey(35 of114)
Open Image ModalNEW YORK - OCTOBER 30: Singer Mariah Carey and actor Nick Cannon attend their Halloween Eve Costume Party at Marquee on October 30, 2008 in New York City. (Photo by Stephen Lovekin/WireImage for Syndicate) (credit:Stephen Lovekin via Getty Images)
Aziz Ansari(36 of114)
Open Image ModalHOLLYWOOD, CA - OCTOBER 31: Comedian/actor Aziz Ansari attends Bacardi and Maroon 5's Annual Halloween Bash held at Hollywood Forever Cemetary on October 31, 2011 in Hollywood, California. (Photo by Charley Gallay/WireImage) (credit:Charley Gallay via Getty Images)
Miley Cyrus, Snoop Dogg, & Paris Hilton(37 of114)
Open Image ModalMiley Cyrus as Lil Kim, Snoop Dogg as Jigsaw, and Paris Hilton as a cat. (credit:Miley Cyrus/Twitter)
Aaron Paul(38 of114)
Open Image ModalAaron Paul (right) and wife Lauren Parsekian attend Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, October 31, 2013 in Los Angeles. (Photo by Todd Williamson/Invision for Jose Cuervo/Ap Images) (credit:Todd Williamson/Invision/AP)
Khloe Kardashian & Christina Milian(39 of114)
Open Image ModalKhloe Kardashian, left, and Christina Milian pose together at the Pur Jeans Halloween Bash in Los Angeles, Friday, Oct. 31, 2008. (AP Photo/Chris Pizzello) (credit:ASSOCIATED PRESS)
Snooki(40 of114)
Open Image ModalWHIPPANY, NJ - OCTOBER 24: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Television personality Nicole 'Snooki' Polizzi, Jionni Lavalle and their son Lorenzo Lavalle celebrate Halloween in their costumes from Rubies Costume Company on October 24, 2013 in Whippany, New Jersey. (Photo by Jamie McCarthy/NEP/Getty Images for Hired Gun Publicity & Consulting) (credit:Jamie McCarthy/NEP via Getty Images)
Kim Kardashian & Kanye West(41 of114)
Open Image ModalMIAMI BEACH, FL - OCTOBER 31: Kim Kardashian and Kanye West arrive at Kim Kardashian's Halloween party at LIV nightclub at Fontainebleau Miami on October 31, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images) (credit:Alexander Tamargo via Getty Images)
Alyssa Milano(42 of114)
Open Image ModalAlyssa Milano during 7th Annual Heidi Klum Halloween Party, Sponsored by M&M's Dark Chocolate - Arrivals at Privilege in Los Angeles, California, United States. (Photo by Jon Kopaloff/FilmMagic) (credit:Jon Kopaloff via Getty Images)
Ellen DeGeneres(43 of114)
Open Image ModalIn this photo provided by Warner Bros., talk show host Ellen DeGeneres, left, reveals her Halloween costume in the likeness of actress Sofia Vergara, right, during the taping of "The Ellen DeGeneres Show" on Tuesday, Oct. 30, 2012, in Burbank, Calif. The special Halloween episode airs on Wednesday. (AP Photo/Warner Bros., Michael Rozman) (credit:ASSOCIATED PRESS)
Adam Brody, Rachel Bilson, Josh Schwartz & Melinda Clarke(44 of114)
Open Image ModalAdam Brody, Rachel Bilson, Josh Schwartz and Melinda Clarke at the SKYY Orange Party (Photo by J.Sciulli/WireImage for The Rose Group) (credit:John Sciulli via Getty Images)
Audrina Patridge(45 of114)
Open Image ModalHOLLYWOOD - OCTOBER 31: Television personality Audrina Patridge attends Halloween 2008 At The Roosevelt Hotel on October 31, 2008 in Hollywood, California. (Photo by Chelsea Lauren/Getty Images) (credit:Chelsea Lauren via Getty Images)
Neil Patrick Harris & David Burtka(46 of114)
Open Image ModalNeil Patrick Harris and David Burtka as vampires. (credit:Neil Patrick Harris/Twitter)
Busy Philipps(47 of114)
Open Image ModalSANTA MONICA, CA - OCTOBER 30: Busy Philipps and daughter Birdie Leigh Silverstein arrive at the 17th Annual Dream Halloween event at Barker Hangar on October 30, 2010 in Santa Monica, California. (Photo by Gregg DeGuire/FilmMagic) (credit:Gregg DeGuire via Getty Images)
Martha Stewart(48 of114)
Open Image ModalMartha Stewart arrives at "Hub Network's First Annual Halloween Bash" on Sunday, Oct. 20, 2013, at the Barker Hanger in Santa Monica, Calif. The star-studded special will be broadcasted on the Hub Network on Saturday Oct. 26, 2013. (Photo by Jordan Strauss/Invision for the Hub/AP Images) (credit:Jordan Strauss/Invision/AP)
Kellan Lutz & Ashley Greene(49 of114)
Open Image ModalLAS VEGAS - OCTOBER 31: Actor Kellan Lutz (L) and actress Ashley Greene from the 'Twilight' movie series arrive at Veuve Clicquot's Yelloween at the Tao Nightclub at the Venetian Resort Hotel Casino October 31, 2009 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) (credit:Ethan Miller via Getty Images)
Heidi Klum(50 of114)
Open Image ModalHeidi Klum attends the 2013 Heidi Klum Halloween Party dressed as an elderly woman, at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic) (credit:Andrew Toth via Getty Images)
Iggy Azalea(51 of114)
Open Image ModalIggy Azalea dressed as Cruella de Vil attends the VEVO Halloween showcase at The Oval Space on October 31, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images) (credit:Gareth Cattermole via Getty Images)
Alessandra Ambrosio(52 of114)
Open Image ModalModel Alessandra Ambrosio, dressed as the Queen Of Hearts, attends the Casamigos Halloween Party at the home of Mike Meldman on October 25, 2013 in Beverly Hills, California. (Photo by Jerod Harris/Getty Images) (credit:Jerod Harris via Getty Images)
Chloe Moretz(53 of114)
Open Image ModalChloe Moretz sighting on October 31, 2012 in London, England. (Photo by Niki Nikolova/FilmMagic) (credit:Niki Nikolova via Getty Images)
Kim Kardashian(54 of114)
Open Image ModalKim Kardashian, dressed as Poison Ivy, attends the Midori Green Halloween costume party at Lavo on October 29, 2011 in New York City. (Photo by Rob Kim/FilmMagic) (credit:Rob Kim via Getty Images)
Scott Disick And Kourtney Kardashian(55 of114)
Open Image ModalScott Disick (dressed as Robin) and Kourtney Kardashian (Dressed As Batman) arrive at Kim Kardashian's Halloween party at LIV nightclub at Fontainebleau Miami on October 31, 2012 in Miami Beach, Florida. (Photo by John Parra/WireImage) (credit:John Parra via Getty Images)
Pink(56 of114)
Open Image ModalSinger Pink, dressed as a clown, arrives at Heidi Klum's 2008 annual Halloween party at 1OAK on October 31, 2008 in New York City. (Photo by Charles Eshelman/FilmMagic) (credit:Charles Eshelman via Getty Images)
Bethenny Frankel(57 of114)
Open Image ModalBethenny Frankel, dressed as Marilyn Monroe, attends Heidi Klum's Halloween presented by Shutterfly at Marquee on October 31, 2013 in New York City. (Photo by Andrew H. Walker/Getty Images for Shutterfly) (credit:Andrew H. Walker via Getty Images)
Dascha Polanco(58 of114)
Open Image ModalActress Dascha Polanco, dressed as the Black Swan, attends Shutterfly Presents Heidi Klum's 14th Annual Halloween Party sponsored by SVEDKA Vodka and smartwater at Marquee on October 31, 2013 in New York City. (Photo by Cindy Ord/Getty Images for Heidi Klum) (credit:Cindy Ord via Getty Images)
June Ambrose(59 of114)
Open Image ModalStylist June Ambrose, dressed as Queen Elizabeth, attends the 2013 Heidi Klum Halloween Party at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic) (credit:Andrew Toth via Getty Images)
Shanina Shaik(60 of114)
Open Image ModalModel Shanina Shaik, dressed as Princess Jasmine attends the 2013 Heidi Klum Halloween Party at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic) (credit:Andrew Toth via Getty Images)
Alexa Chung(61 of114)
Open Image ModalAlexa Chung, dressed as Marie Antoinette, attends the Browns Focus Halloween party hosted by Alexa Chung at St Banabas House in Soho on October 31, 2008 in London, England. (Photo by Dave M. Benett/Getty Images) (credit:Dave M. Benett via Getty Images)
Anne Hathaway(62 of114)
Open Image ModalActress Anne Hathaway, dressed as Cleopatra, attends Heidi Klum's 5th Annual Halloween party at Marquee October 31, 2004 in New York City. (Photo by Evan Agostini/Getty Images) (credit:Evan Agostini via Getty Images)
Fergie And Josh Duhamel(63 of114)
Open Image ModalDressed as sexy Elvira and a ghastly ghoul (credit:X17)
Michelle Trachtenberg(64 of114)
Open Image ModalActress Michelle Trachtenberg attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini) (credit:AP)
Paulina Gretzky(65 of114)
Open Image Modal (credit:Paulina Gretzky/Twitter)
Stacy Ferguson(66 of114)
Open Image ModalSinger Stacy "Fergie" Ferguson attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini) (credit:AP)
Heidi Klum(67 of114)
Open Image ModalHeidi Klum, dressed as Cleopatra, attends her Haunted Holiday Party benefiting Superstorm Sandy relief efforts, on Saturday, Dec. 1, 2012 in New York. Klum's original party, scheduled to be held on Halloween, was postponed due to the storm. (Photo by Charles Sykes/Invision/AP) (credit:AP)
Heidi Klum, Seal(68 of114)
Open Image ModalModel and television personality Heidi Klum, left, and husband Seal attend Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini) (credit:AP)
Kim Kardashian(69 of114)
Open Image Modal Kim Kardashian attends 2nd Annual Midori Green Halloween Party at Avenue on October 27, 2012 in New York City dressed as a mermaid. (credit:Getty Images)
Katy Perry(70 of114)
Open Image ModalKaty Perry as Jane Lane and Shannon Woodward as Daria. (credit:Katy Perry/Twiiter)
Kate Upton(71 of114)
Open Image ModalModel Kate Upton attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini) (credit:AP)
Debra Messing(72 of114)
Open Image Modal"HAPPY HALLOWEEN!! Me and Mariska starting the night!! #boo," the "Smash" star tweeted Wednesday. (credit:Debra Messing/Twitter)
Darren Criss(73 of114)
Open Image ModalDarren Criss is a boy scout and probably a big fan of "Moonrise Kingdom." (credit:PacificCoastNews)
Jenni 'JWoww' Farley, Roger Mathews(74 of114)
Open Image ModalWe never thought we'd say it, but the "Jersey Shore" star and her fiancé positively geeked it out. (credit:PacificCoastNews)
Christina Milian(75 of114)
Open Image ModalNo sleight of hand here. Christina Milian is the Queen of Hearts. (credit:PacificCoastNews)
Stacy Keibler(76 of114)
Open Image ModalGeorge Clooney's girlfriend is "Black Swan." (credit:PacificCoastNews)
Tish Cyrus, Brandi Cyrus(77 of114)
Open Image ModalPop starlet Miley Cyrus' mum and sister Tish Cyrus and Brandi Cyrus are all dressed up for Halloween as they head to the Roosevelt hotel for a party in Hollywood. (credit:PacificCoastNews)
Sacha Baron Cohen(78 of114)
Open Image ModalSacha Baron Cohen donned a bizarre monkey-cow costume. (credit:FameFlynet)
P. Diddy(79 of114)
Open Image ModalP. Diddy rocked out at the Playboy Mansion Halloween Party in Beverly Hills, California on October 27th, 2012. (credit:FameFlynet)
Brandon Davis(80 of114)
Open Image ModalBrandon Davis at the Playboy Mansion Halloween Party in Beverly Hills, California on October 27th, 2012. (credit:FameFlynet)
Lucy Hale(81 of114)
Open Image ModalLucy Hale as a unicorn. (credit:Lucy Hale/Twitter)
Shenae Grimes, Chris March(82 of114)
Open Image ModalIn this Image released by Mattel, actress Shenae Grimes, from the series "90210", left, has a fitting of her Monster High Frankie Stein Halloween costume created by "Project Runway" alum Chris March, Wednesday, Oct. 17, 2012, in El Segundo, Calif. Grimes will be attending "Glee" cast member Matthew Morrison's 3rd Annual Halloween Bash, dressed as Frankie Stein, daughter of Frankenstein, from the popular Monster High franchise. This year, the popular Halloween party will be sponsored by Monster High. (AP Photo/Mattel, Rene Macura) (credit:AP)
Heidi Klum(83 of114)
Open Image Modal Heidi Klum gets fitted for her 13th annual Halloween party at finale sponsored by HobNob Wines, Svedka Vodka And Smartwater on September 3, 2012 in New York City. (credit:Getty Images)
Sarah Hyland(84 of114)
Open Image ModalSarah Hyland as Spinelli from "Recess." (credit:Sarah Hyland/Twitter)
Nicole Scherzinger(85 of114)
Open Image ModalNicole Scherzinger as a vampire. (credit:James Curley/Coalition Pictures)
Kim Kardashian(86 of114)
Open Image ModalKim Kardashian as a leopard. (credit:Kim Kardashian/Twitter)
Holly Madison(87 of114)
Open Image ModalHolly Madison as Sleeping Beauty. (credit:Holly Madison/Twitter)
Fergie(88 of114)
Open Image ModalFergie as Lindsay Lohan. (credit:Fergie/Twitter)
Christina Milian(89 of114)
Open Image ModalChristina Milian as Sulley. (credit:Christina Milian/Twitter)
Fergie & Josh Duhamel(90 of114)
Open Image ModalFergie & Josh Duhamel as Angelyne & Dennis Woodruff. (credit:FameFlynet)
Christina Aguilera(91 of114)
Open Image ModalChristina Aguilera as ??? (credit:Pacific Coast News)
Paris Hilton(92 of114)
Open Image ModalParis Hilton as Alice. (credit:X17Online)
Kris Jenner(93 of114)
Open Image ModalKris Jenner as Wonder Woman. (credit:Kris Jenner/Twitter)
Ashley Benson(94 of114)
Open Image ModalAshley Benson as Tweedle Dee (or Dumb). (credit:Ashley Benson/Twitter)
Hugh Hefner(95 of114)
Open Image ModalHugh Hefner as a vampire. (credit:Hugh Hefner/Twitter)
Holly Madison(96 of114)
Open Image ModalHolly Madison as the Cheshire Cat. (credit:Holly Madison/Twitter)
Jessica Alba, Cash Warren, & Honor Warren(97 of114)
Open Image ModalThe Incredibles (credit:Jessica Alba/Twitter)
Lauren Conrad(98 of114)
Open Image Modal (credit:Lauren Conrad/Twitter)
Hilary Duff(99 of114)
Open Image ModalHilary Duff in a Día de los Muertos costume. (credit:Hilary Duff/Twitter)
Kim Kardashian(100 of114)
Open Image ModalKim Kardashian as Kris Jenner. (credit:Kim Kardashian/Twitter)
Fergie(101 of114)
Open Image ModalFergie as a sexy cat. (credit:Fergie/Twitter)
Ryan Seacrest & Julianne Hough(102 of114)
Open Image ModalBonnie & Clyde (credit:Julianne Hough/Instagram)
Julie Bowen(103 of114)
Open Image ModalJulie Bowen as a scary Bo Peep. (credit:Julie Bowen/WhoSay)
Genevieve Jones & Nicky Hilton(104 of114)
Open Image ModalGenevieve Jones & Nicky Hilton as a KISS member and a leopard. (credit:Genevieve Jones/Twitter)
Adam Lambert(105 of114)
Open Image ModalAdam Lambert as a vampire. (credit:Adam Lambert/Twitter)
Chord Overstreet(106 of114)
Open Image Modal (credit:Chortd Overstreet/Twitter)
Heidi Montag & Crystal Harris(107 of114)
Open Image Modal (credit:Heidi Montag /Twitter)
Jesse McCartney(108 of114)
Open Image Modal (credit:Jesse McCartney/Twitter)
Diddy & Holly Robinson Peete(109 of114)
Open Image ModalAs Prince. (credit:Holly Robinson Peete/Twitter)
Bella Thorne(110 of114)
Open Image ModalBella Thorne as a vampire bride. (credit:Bella Thorne/Twitter)
Liam Payne(111 of114)
Open Image ModalLiam Payne as Batman. (credit:Liam Payne/Twitter)
Shanae Grimes(112 of114)
Open Image ModalShanae Grimes as a skeleton. (credit:Josh Beech/Twitter)
Scott Disick(113 of114)
Open Image ModalScott Disick as Patrick Bateman. (credit:Getty Images)
Nicole Richie(114 of114)
Open Image ModalNicole Richie and friends as Wilderness Girls from "Troop Beverly Hill." (credit:Nicole Richie/Twitter)