Celebrity Cameos: Stars Who Have Parodied Themselves In Films And TV Shows (PHOTOS)

What Do These Celebs Have In Common?
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Celebrity cameo roles are nothing new to the entertainment industry. Big name stars, athletes and artists have slid into the background of hundreds of films, oftentimes acting as a comedic addition to the scene or an homage. Ever see an Alfred Hitchcock film?

But the best type of cameo -- one that has taken off recently -- is the on-screen appearance of a celebrity who is acting as him or herself. Though some cameos are more refined, most self-parodies tend to be a bit exaggerated for your viewing pleasure -- Topher Grace in "Ocean's Twelve," for example.

Which begs the question, if these stars are parodying themselves, are they really acting?

Check out the gallery below to see some of the best celebrity cameo self-parodies. And if you really want to challenge yourself, try to guess the movie or TV show the celeb appeared in (answers at bottom of photo).

Celebrity Cameos: Stars Who Have Played Themselves
Neal Patrick Harris(01 of46)
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"Harold & Kumar Go to White Castle" and "Harold & Kumar Escape from Guantanamo Bay" (credit:Getty)
Bob Barker(02 of46)
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"Happy Gilmore" (credit:Getty)
Steve Carell (03 of46)
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"Knocked Up" (credit:AP)
Sir Ben Kingsley (04 of46)
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"The Sopranos" (credit:Getty)
Mike Tyson(05 of46)
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"The Hangover" (credit:Getty)
Al Gore(06 of46)
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"30 Rock" (credit:Getty)
Bruce Willis(07 of46)
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"Ocean's Twelve" (credit:Getty)
Britney Spears(08 of46)
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"Glee," "Kenan & Kel," and "Sabrina The Teenage Witch" (credit:Getty)
Bill Murray(09 of46)
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"Zombieland" (credit:Getty)
Pamela Anderson(10 of46)
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"Borat: Cultural Learnings Of America For Make Benefit Glorious" (credit:Getty)
George Lucas(11 of46)
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"The O.C." (credit:Getty)
Topher Grace(12 of46)
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"Ocean's Eleven" and "Ocean's Twelve" (credit:Getty)
George Takei (13 of46)
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"The Big Bang Theory," "Party Down," "Psych," "Will & Grace" and "3rd Rock From The Sun" (credit:Getty)
John Malkovitch(14 of46)
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"Being John Malkovitch" (credit:Getty)
Oprah Winfrey(15 of46)
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"30 Rock" (credit:AP)
Ryan Seacrest (16 of46)
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"Knocked Up" (credit:Getty)
The Spice Girls(17 of46)
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"Spice World" (credit:Getty)
Alice Cooper And Band(18 of46)
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"Wayne's World" (credit:Getty)
Chuck Norris(19 of46)
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"Dodgeball: A True Underdog Story" (credit:AP)
Kelsey Grammer(20 of46)
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"30 Rock" and "Cheers" (credit:Getty)
Heather Graham(21 of46)
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"Sex And The City," "Scream 2," "Scream 4" and "Portlandia" (credit:Getty)
Donald Trump(22 of46)
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"Home Alone 2: Lost In New York" (credit:Getty)
Conan O'Brien(23 of46)
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"30 Rock," "The Office," "Bewitched," and "Vanilla Sky," (credit:AP)
Jessica Alba (24 of46)
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"Knocked Up" (credit:Getty)
Bruce Springsteen (25 of46)
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"High Fidelity" (credit:Getty)
Billy Idol(26 of46)
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"The Wedding Singer" (credit:Getty)
Sandra Bernhard(27 of46)
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"Will & Grace" and "Zoolander" (credit:Getty)
Shaq(28 of46)
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"Freddy Got Fingered," "Scary Movie 4," and "Curb Your Enthusiasm" (credit:Getty)
Joshua Jackson(29 of46)
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"Ocean's Eleven" (credit:Getty)
Jerry Seinfeld(30 of46)
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"30 Rock" and "Curb Your Enthusiasm" (credit:Getty)
Eva Mendes (31 of46)
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"Knocked Up" (credit:Getty)
Elvis Costello(32 of46)
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"Spice World" (credit:Getty)
Regis Philbin (33 of46)
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"Borat: Cultural Learnings Of America For Make Benefit Glorious" (credit:Getty)
Josh Groban (34 of46)
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"Glee" (credit:Getty)
Lance Armstrong(35 of46)
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"Dodgeball: A True Underdog Story" (credit:Getty)
Dax Shepard (36 of46)
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"Knocked Up" (credit:Getty)
Shane West (37 of46)
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"Ocean's Eleven" (credit:Getty)
Kevin Smith And Jason Mewes (38 of46)
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"Degrassi: The Next Generation" and "Degrassi Goes Hollywood" (credit:Getty)
Elton John(39 of46)
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"Spice World" (credit:Getty)
Bryan Williams(40 of46)
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"30 Rock" (credit:Getty)
Katee Sackhoff(41 of46)
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"The Big Bang Theory" (credit:Getty)
Andy Dick(42 of46)
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"Knocked Up" (credit:Getty)
Jean-Claude Van Damme(43 of46)
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"Friends" and "Las Vegas" (credit:Getty)
Lucy Liu(44 of46)
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"Sex And The City" (credit:Getty)
Megan Fox(45 of46)
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"The Dictator" (credit:Getty)
Celebs On "Entourage"(46 of46)
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Too many to count... (credit:Getty)

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