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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.
Credit: David Livingston/Getty
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Country singer Miranda Lambert went as Honey Boo Boo for Halloween, tweeting: "We should both win Supreme titles!"
Credit: Personal Photo/Twitter
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Pop singer Ke$ha gets decked out for Halloween 2012.
Credit: Ke$ha/Personal Photo/Twitter
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Jennifer Lopez and Casper Smart dress up as hippies for Halloween 2012.
Credit: JenniferLopez.com
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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.
Credit: Katy Perry/Personal Photo/Twitter
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Selena Gomez dons a cat costume for Halloween 2012.
Credit: Selena Gomez/Personal Photo/Twitter
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Credit: Chris Brown/Personal Photo/Twitter
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Leann Rimes, posing alongside her beau Eddie Cibrian, dressed up as "Sandy" and "Danny" from the movie "Grease" for Halloween 2012.
Credit: Personal Photo/Twitter
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Lady Gaga posted this Halloween photo along with the caption: "HAPPY HIGHLAWEEN!!"
Credit: Lady Gaga/Personal Photo/Twitter
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Singer Pink, right, dressed up for Halloween 2012.
Credit: Personal Photo/Twitter
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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!"
Credit: Avril Lavigne/Personal Photo/Twitter
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Actor Jon Cryer poses in his costume for Halloween 2012.
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Comedian Patton Oswalt tweeted this photo along with the caption: "Mission accomplished. With a LOT of help from @donttrythis (MYTHBUSTERS' Adam Savage). #Halloween #doctorockapus"
Credit: Personal Photo/Twitter
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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
Credit: Personal Photo/Twitter
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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.
Credit: David Livingston/Getty
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Kristin Cavallari hosts the Bing It On Halloween Costume Challenge at Spirit Halloween on Oct. 19, 2012, in New York.
Credit: Dimitrios Kambouris/Getty Images for Bing
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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.
Credit: Christopher Polk/Getty Images for Mattel
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Lady Antebellum tweeted this photo for Halloween 2012, along with the caption: "Happy Halloween! Love, Brooks Dunn and Reba."
Credit: Lady Antebellum/Personal Photo/Twitter
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Kings of Leon's Jared Followill poses with his model wife, Martha, for Halloween 2012.
Credit: Personal Photo/Twitter
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Jessica Simpson, Eric Johnson and Baby Maxwell get dressed up for Maxwell's first Halloween.
Credit: Jessica Simpson/Personal Photo/Twitter
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Miley Cyrus, right, dressed up as rapper Nicki Minaj, for Halloween 2012.
Credit: Miley Cyrus/Personal Photo/Twitter
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Boy band One Direction posted this Halloween 2012 photo on Twitter.
Credit: Personal Photo/Twitter
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Actor Chris Colfer went to the set of "Glee" in his Halloween costume on Oct. 31, 2012.
Credit: Personal Photo/Twitter
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Ellen Degeneres, left, dresses up as actress Sofia Vergara, right, for her Halloween 2012 show.
Credit: Ellen/Warner Bros.
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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.
Credit: Heidi Klum/Personal Photo/Twitter
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"Glee" star Darren Criss, far left, stands next to fellow "Glee" star Matthew Morrison, dressed as Justin Timberlake, in Los Angeles.
Credit: Matthew Morrison/Personal Photo
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Kim Kardashian hosts the 2nd Annual Midori Green Halloween Party on Oct. 27, 2012, in New York.
Credit: Charles Sykes
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Credit: Steven Lawton/Getty Images
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Credit: Dimitrios Kambouris
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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.
Credit: David Livingston/Getty Images
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Credit: Steven Lawton/Getty Images for Hyde Bellagio
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Author and televison host Padma Lakshmi attends 11th Annual Dream Halloween at Hard Rock Cafe, Times Square, on Oct. 21, 2012, in New York.
Credit: Brad Barket/Getty Images
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Credit: Dave Kotinsky/Getty Images
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Kim Kardashian attends the 2nd Annual Midori Green Halloween Party at Avenue on Oct. 27, 2012, in New York.
Credit: Dave Kotinsky
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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.
Credit: Imeh Akpanudosen/Getty Images
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Credit: Kim Kardashian/Personal Photo/Instagram
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Actress Jessica Alba, her husband Cash Warren and Honor as The Incredibles for Halloween 2012.
Credit: Jessica Alba/Personal Photo/Twitter
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Credit: Nicole Richie/Personal Photo/Twitter
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Comedian Aziz Ansari as "Bane the Tank Engine" for Halloween 2012.
Credit: Aziz Ansari/Personal Photo/Twitter
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Hilary Duff, Halloween 2012
Credit: Hilary Duff/Personal Photo/Twitter
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Paris Hilton, third from left, poses with friends for Halloween 2012.
Credit: Paris Hilton/Personal Photo/Twitter
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Adam Lambert and boyfriend Sauli Koskinen celebrate Halloween 2012 in Los Angeles.
Credit: Adam Lambert/Personal Photo/Twitter
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Singer Lance Bass, as a clown, poses with Hamburger Mary, for Halloween 2012.
Credit: Lance Bass/Personal Photo/Twitter
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Reality TV star Kris Jenner dresses up for Halloween 2012.
Credit: Kris Jenner/Personal Photo
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Credit: Fergie/Personal Photo/Twitter
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"Glee" star Chord Overstreet, left, dresses as actor Brad Pitt for Halloween 2013.
Credit: Chord Overstreet/Personal Photo/Twitter
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Credit: JWOWW/Personal Photo/Twitter
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Singer/actress Lucy Hale dresses up as a unicorn for Halloween 2012.
Credit: Lucy Hale/Personal Photo/Twitter
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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 2011Credit: Diddy/Personal Photo/Twitter
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Actor Liam Payne dresses up as Batman for Halloween 2012.
Credit: Liam Payne/Personal Photo/Twitter
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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.
Credit: Brad Barket/Getty Images
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Credit: David Burtka/Personal Photo/Twitter
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Credit: Personal Photo/Twitter
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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.
Credit: Christopher Polk/Getty Images for Mattel)
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Singer Aubrey O'Day dresses up for Halloween 2012, tweeting: "Made my entire Native American look... feather by feather."
Credit: Aubrey O'Day/Personal Photo/Twitter
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Singer Christina Milian gets dolled up for Halloween 2012.
Credit: Christina Milian/Personal Photo/Twitter
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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.
Credit: Ryan Seacrest/Personal Photo/Twitter
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Credit: Rachel Zoe/Personal Photo/Twitter
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Holly Madison, left, gets ready to go out for Halloween 2012.
Credit: Holly Madison/Personal Photo/Instagram
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Credit: Lauren Conrad/Personal Photo/Instagram
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Credit: Kyle Richards/Personal Photo/Instagram
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"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."
Credit: Chris Colfer/Personal Photo/Twitter
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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 2011Credit: Personal Photo/Twitter
