73199_britney_spears04(01 of22)
Open Image Modal7/31/99 Universal City, CA. Teen pop sensation, Britney Spears performing at the Universal Ampitheater for her 'Baby One More Time' tour. Photo by Brenda Chase/Online USA, Inc. (credit:Getty Images)
Britney Spears File Photos(02 of22)
Open Image ModalBritney Spears performs on Tv show 'Festivalbar' Verona 09/07/99, Italy (Photo by Diena/Brengola/WireImage) (credit:Getty Images)
BRITNEY SPEARS LIVE AT JONES BEACH THEATER(03 of22)
Open Image ModalSinger Britney Spears performing live in concert at Jones Beach Marine Theater in New York. 6/27/00 Photo: Scott Gries/Getty Images (credit:Getty Images)
BRITNEY SPEARS LIVE AT JONES BEACH THEATER(04 of22)
Open Image ModalSinger Britney Spears performing live in concert at Jones Beach Marine Theater in New York. 6/27/00 Photo: Scott Gries/Getty Images (credit:Getty Images)
Michael Jackson Concert - Day 1(05 of22)
Open Image ModalMichael Jackson performs with Britney Spears during the Michael Jackson '30th Anniversary Celebration, The Solo Years' concert at New York's Madison Square Garden, Friday, Sept. 7, 2001. Photo by Frank Micelotta/ImageDirect. (credit:Getty Images)
US pop star Britney Spears performs in F(06 of22)
Open Image ModalUS pop star Britney Spears performs in Frankfurt 14 May 2004 during her European 'Onyx Hotel Tour 2004'. Spears is performing songs from her new release 'In The Zone'. Spears will perform in Hamburg, Berlin, Munich, Riesa and Oberhausen. (Photo credit should read THOMAS LOHNES/AFP/Getty Images) (credit:Getty Images)
Britney Spears Concert(07 of22)
Open Image ModalBritney Spears performing at the Nassau Veterans Memorial Coliseum in Uniondale, New York on November 7, 2001. photo by Gabe Palacio/Getty Images (credit:Getty Images)
Britney Spears Concert(08 of22)
Open Image ModalBritney Spears performing at the Nassau Veterans Memorial Coliseum in Uniondale, New York on November 7, 2001. photo by Gabe Palacio/Getty Images (credit:Getty Images)
Denmark: Britney Spears Plays Copenhagen(09 of22)
Open Image ModalCOPENHAGEN, DENMARK - MAY 9: Popstar Britney Spears performs on stage during her 2004 'Onyx Hotel Tour' on May 9, 2004 at The Forum, in Copenhagen, Denmark. (Photo by Patrik Jonsson/Getty Images) (credit:Getty Images)
(FILES): This 05 June 2004 file photo sh(10 of22)
Open Image ModalLisbon, PORTUGAL: (FILES): This 05 June 2004 file photo shows US pop idol Britney Spears singing in concert at the six-day music festival 'Rock in Rio' in Lisbon, Portugal. Spears is pregnant again, just eight months after giving birth to her first child, her publicist told AFP on 09 May 2006. 'She's pregnant,' said the 24-year-old singing superstar's spokeswoman Leslie Sloane Zelnik. Spears, 24, and her husband Kevin Federline, 28, welcomed their son Sean Preston into the world in Los Angeles on September 14, a year after they married secretly after a whirlwind romance. AFP PHOTO/FILES/Miguel RIOPA (Photo credit should read MIGUEL RIOPA/AFP/Getty Images) (credit:Getty Images)
2007 MTV Video Music Awards - Show(11 of22)
Open Image ModalLAS VEGAS - SEPTEMBER 09: Singger Britney Spears performs at the 2007 MTV Video Music Awards at The Pearl Concert Theater on September 9, 2007 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage) (credit:Getty Images)
Britney Spears(12 of22)
Open Image ModalBritney Spears performs on a stage during a concert in Moscow, Russia, Saturday, Sept. 24, 2011. Britney Spears performs in Moscow, St.Petersburg and Kiev as part of her European tour. (AP Photo) (credit:AP)
Britney Spears(13 of22)
Open Image ModalBritney Spears, center, performs on a stage during a concert in Moscow, Russia, Saturday, Sept. 24, 2011. Britney Spears performs in Moscow, St.Petersburg and Kiev as part of her European Femme Fatale Tour. (AP Photo) (credit:AP)
Britney Spears(14 of22)
Open Image ModalBritney Spears performs on stage during a concert in Kiev, Ukraine, Tuesday, Sept. 27, 2011. Spears performs in Moscow, St. Petersburg and Kiev as part of her European Femme Fatale tour. (AP Photo/Yaroslav Debelyi) (credit:AP)
Britney Spears(15 of22)
Open Image ModalBritney Spears performs during a free outdoor concert at the Revolution Monument in Mexico City, Sunday Dec. 4, 2011. (AP Photo/Marco Ugarte) (credit:AP)
ABC's "Good Morning America" - 2011(16 of22)
Open Image ModalGOOD MORNING AMERICA - 3/27/11, San Francisco, CA - Britney Spears taped an exclusive concert performance for GOOD MORNING AMERICA from the Bill Graham Civic Auditorium in San Francisco, which will air on TUESDAY morning, MARCH 29 (7-9am, ET) on the ABC Television Network. (Photo by Rick Rowell/ABC via Getty Images)BRITNEY SPEARS (credit:Getty Images)
ABC's "Good Morning America" - 2011(17 of22)
Open Image ModalGOOD MORNING AMERICA - 3/27/11, San Francisco, CA - Britney Spears taped an exclusive concert performance for GOOD MORNING AMERICA from the Bill Graham Civic Auditorium in San Francisco, which will air on TUESDAY morning, MARCH 29 (7-9am, ET) on the ABC Television Network. (Photo by Rick Rowell/ABC via Getty Images)BRITNEY SPEARS (credit:Getty Images)
"The Circus Starring Britney Spears" Tour In Newark - Show - March 13, 2009(18 of22)
Open Image ModalBritney Spears performs during 'The Circus Starring Britney Spears' tour at Prudential Center on March 13, 2009 in Newark, New Jersey. (credit:Getty Images)
Britney Spears(19 of22)
Open Image ModalFILE - In this Sept. 27, 2011 file photo, singer Britney Spears performs on a stage during a concert in Kiev, Ukraine, during her European Femme Fatale Tour. A source says she is joining Simon Cowell's singing contest as a judge on the singing competition series "The X-Factor."(AP Photo/Leonid Naidiouk, file) (credit:AP)
Britney Spears(20 of22)
Open Image ModalFILE - In this Sept. 24, 2011 file photo, singer Britney Spears performs on a stage during a concert in Moscow, Russia, during her European tour. A source says she is joining Simon Cowell's singing contest as a judge on the singing competition series "The X-Factor."(AP Photo, file) (credit:AP)
Britney Spears Tour 2004(21 of22)
Open Image ModalBritney Spears during Britney Spears Tour 2004 at Oakland Coliseum in Oakland, California, United States. (Photo by Arun Nevader/FilmMagic) (credit:Getty Images)
"The Circus Starring Britney Spears" Tour Opens In New Orleans(22 of22)
Open Image ModalNEW ORLEANS - MARCH 03: **EXCLUSIVE COVERAGE** Singer Britney Spears performs onstage during the opening night of 'The Circus Starring Britney Spears' tour at the New Orleans Arena on March 3, 2009 in New Orleans, Louisiana. (Photo by Kevin Mazur/Getty Images for Jive Records) (credit:Getty Images)