Stars' Halloween costumes 2012

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Pop singer Rihanna is named Queen of the West Hollywood Halloween Carnaval by the City of West Hollywood in celebration of Halloween 2012 at a Halloween party at Greystone Manor Supperclub on Oct. 31, 2012, in West Hollywood, Calif.

Country singer Miranda Lambert went as Honey Boo Boo for Halloween, tweeting: "We should both win Supreme titles!"

Pop singer Ke$ha gets decked out for Halloween 2012.

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Jennifer Lopez and Casper Smart dress up as hippies for Halloween 2012.

Singer Katy Perry, left, and actress Shannon Woodward dressed up as MTV animated characters, Daria and her best friend Jane Lane on Oct. 31, 2012, in Hollywood, Calif.

Selena Gomez dons a cat costume for Halloween 2012.

Chris Brown and friends dressed up as Arab terrorists in beards and turbans for Halloween 2012.

Is Chris Brown's costume offensive?

Leann Rimes, posing alongside her beau Eddie Cibrian, dressed up as "Sandy" and "Danny" from the movie "Grease" for Halloween 2012.

Lady Gaga posted this Halloween photo along with the caption: "HAPPY HIGHLAWEEN!!"

Singer Pink, right, dressed up for Halloween 2012.

Avril Lavigne tweeted this Halloween 2012 photo along with the caption: Tick or Treat... Happy Halloween! Hope everyone had a good safe night. Anchors away!"

Actor Jon Cryer poses in his costume for Halloween 2012.

Comedian Patton Oswalt tweeted this photo along with the caption: "Mission accomplished. With a LOT of help from @donttrythis (MYTHBUSTERS' Adam Savage). #Halloween #doctorockapus"

Neil Patrick Harris, left, tweeted this Halloween 2012 photo along with the caption: "Happy Halloween everyone! Hope your tricking and treating gotcha lotsa booty! Here

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From left, the Abbey's David Cooley, recording artist Rihanna and guest attend Rihanna's Queen of the West Hollywood Halloween Carnaval at Greystone Manor Supperclub on Oct. 31, 2012, in West Hollywood, Calif.

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Kristin Cavallari hosts the Bing It On Halloween Costume Challenge at Spirit Halloween on Oct. 19, 2012, in New York.

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"90210" star Shenae Grimes, dressed as Monster High's Frankie Stein, leaves for Matthew Morrison's 3rd Annual Halloween Party on Oct. 28, 2012, in Los Angeles.

Lady Antebellum tweeted this photo for Halloween 2012, along with the caption: "Happy Halloween! Love, Brooks Dunn and Reba."

Kings of Leon's Jared Followill poses with his model wife, Martha, for Halloween 2012.

Jessica Simpson, Eric Johnson and Baby Maxwell get dressed up for Maxwell's first Halloween.

Miley Cyrus, right, dressed up as rapper Nicki Minaj, for Halloween 2012.

Boy band One Direction posted this Halloween 2012 photo on Twitter.

Actor Chris Colfer went to the set of "Glee" in his Halloween costume on Oct. 31, 2012.

Ellen Degeneres, left, dresses up as actress Sofia Vergara, right, for her Halloween 2012 show.

Model Heidi Klum, dressed as Cleopatra, gets her costume ready a week before Halloween. She ended up canceling her annual Halloween bash because of Superstorm Sandy.

"Glee" star Darren Criss, far left, stands next to fellow "Glee" star Matthew Morrison, dressed as Justin Timberlake, in Los Angeles.

Kim Kardashian hosts the 2nd Annual Midori Green Halloween Party on Oct. 27, 2012, in New York.

Actress/model Stacy Keibler arrives at Hyde Bellagio at the Bellagio to host a Halloween masquerade party on Oct. 27, 2012, in Las Vegas.

Pictures: Halloween in Hollywood 2011

Kristin Cavallari hosts the Bing It On Halloween Costume Challenge at Spirit Halloween on Oct. 19, 2012, in New York.

Pictures: Halloween in Hollywood 2011

Actress Jaime Pressly with son Dezi James Calvo, left, and guest attend EBMRF & Sony PlayStation's Epic Halloween Bash hosted by James Marsden and Courteney Cox on Oct. 27, 2012, in Los Angeles.

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Actress/model Stacy Keibler hosts a Halloween masquerade party at Hyde Bellagio at the Bellagio on Oct. 27, 2012, in Las Vegas.

Pictures: Halloween in Hollywood 2011

Author and televison host Padma Lakshmi attends 11th Annual Dream Halloween at Hard Rock Cafe, Times Square, on Oct. 21, 2012, in New York.

Musician Prince Malik attends 2nd Annual Midori Green Halloween Party at Avenue on Oct. 27, 2012, in New York.

Pictures: Halloween in Hollywood 2011

Kim Kardashian attends the 2nd Annual Midori Green Halloween Party at Avenue on Oct. 27, 2012, in New York.

Actress/singer Sabrina Bryan attends the 2012 'Dream Halloween' presented by Keep A Child Alive at Barker Hangar on Oct. 27, 2012 in Santa Monica, Calif.

Kim Kardashain and Kanye West get ready for the 2nd Annual Midori Green Halloween Party at Avenue on Oct. 27, 2012, in New York.

Pictures: Halloween in Hollywood 2011

Actress Jessica Alba, her husband Cash Warren and Honor as The Incredibles for Halloween 2012.

Nicole Richie (bottom left with sunglasses) celebrates Halloween 2012 with friends dressed up as Girl Scouts

Pictures: Halloween in Hollywood 2011

Comedian Aziz Ansari as "Bane the Tank Engine" for Halloween 2012.

Hilary Duff, Halloween 2012

Paris Hilton, third from left, poses with friends for Halloween 2012.

Adam Lambert and boyfriend Sauli Koskinen celebrate Halloween 2012 in Los Angeles.

Singer Lance Bass, as a clown, poses with Hamburger Mary, for Halloween 2012.

Reality TV star Kris Jenner dresses up for Halloween 2012.

Singer Fergie, left, posts a photo on Twitter from Halloween 2012.

Pictures: Halloween in Hollywood 2011

"Glee" star Chord Overstreet, left, dresses as actor Brad Pitt for Halloween 2013.

"Jersey Shore" star JWOWW dresses up as a nerd for Halloween 2012 party in Las Vegas.

Pictures: Halloween in Hollywood 2011

Singer/actress Lucy Hale dresses up as a unicorn for Halloween 2012.

Sean "Diddy" Combs tweeted this Halloween 2012 photo on Oct. 28 along with the caption: "Check dis out!! RT @CassieSuper: Cleopatra & Prince! Happy Halloween!!!!"

Pictures: Halloween in Hollywood 2011

Actor Liam Payne dresses up as Batman for Halloween 2012.

Singer Cody Simpson, left, and Padma Lakshmi attend 11th Annual Dream Halloween at Hard Rock Cafe, Times Square on Oct. 21, 2012, in New York.

Neil Patrick Harris, left, spends Halloween 2012 with his longtime partner, David Burtka, right.

Pictures: Halloween in Hollywood 2011

Patrick Schwarzenegger posted these two photos from Halloween 2012.

Pictures: Halloween in Hollywood 2011

"90210" star Shenae Grimes, dressed as Monster High's Frankie Stein, leaves for Matthew Morrison's 3rd Annual Halloween Party on Oct. 28, 2012, in Los Angeles.

Singer Aubrey O'Day dresses up for Halloween 2012, tweeting: "Made my entire Native American look... feather by feather."

Singer Christina Milian gets dolled up for Halloween 2012.

Ryan Seacrest tweeted this photo of him and girlfriend Julianna Hough, right, dressed up bank robbers Bonnie and Clyde, portrayed by Warrren Beatty and Faye Dunaway in a movie scene on right.

Fashion stylist Rachel Zoe, dressed as a flapper, poses with Rodger Berman for Halloween 2012.

Pictures: Halloween in Hollywood 2011

Holly Madison, left, gets ready to go out for Halloween 2012.

TV personality/fashion designer Lauren Conrad is seen here with her boyfriend, William Tell.

Pictures: Halloween in Hollywood 2011

"Real Housewives of Beverly Hills" star Kyle Richards, right, attends a Halloween benefit in Los Angeles on. Oct. 28, 2012.

Pictures: Halloween in Hollywood 2011

"Glee" star Chris Colfer tweeted this Halloween 2012 photo, along with the caption: "Happy Halloween! Hooves crossed I'm the only one dressed as a llama assassin."

Avril Lavigne's ex-husband, Sum-41's Deryck Whibley, dressed up as Lavigne for Halloween 2012. Whibley's current girlfriend, Ari Cooper, dressed up as Lavigne's new fiance, Chad Kroeger, frontman of Nickelback.

Pictures: Halloween in Hollywood 2011