Celebrity Halloween Costumes 2011

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Heidi Klum

Dressed as a skinless corpse, the Project Runway host arrived on a gurney at Tao Las Vegas Saturday. She topped off the look with yellow prosthetic teeth, red contact lenses and a bald head cap.

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Chace Crawford

The Gossip Girl actor (left) and his two pals suited up as the Teenage Mutant Ninja Turtles at Matthew Morrison and Podwall Entertainment's SVEDKA-sponsored Halloween bash at L.A.'s Voyeur Saturday.

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Julianne Hough

Before Julianne unveiled her Poison Ivy costume, she gave fans a hint via Twitter: "Wearing my red wig that I wore in Burlesque, but my character is from another movie!"

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Jessica Alba and Cash Warren

With Warren dressed as a football player, the Little Fockers star went out for her "second night as a witch" on Saturday. "Better costume this time!" she tweeted.

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Nicole "Snooki" Polizzi

Meow! The pint-sized Jersey Shore star sported freaky contact lenses and fake tattoos to become a sexy leopard at PURE Nightclub in Las Vegas Sunday.

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Lea Michele

For Matthew Morrison's Halloween party in Hollywood Saturday, the Glee starlet channeled Natalie Portman as the Swan Queen from Black Swan.

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Zachary Quinto

"I am fireworks on the fourth of July," the Heroes alum announced via Twitter Saturday. "I wasn't going out as of ten minutes ago. A little proud of what I threw together."

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AnnaLynne McCord

The 90210 star (far right) dressed as Marie Antoinette with sisters Angel and Rachel for Rachel's 21st birthday party at PURE nightclub in Las Vegas Friday.

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Scott Disick

He's no saint, but that didn't stop the E! reality star from dressing up as a priest during an appearance at Sugar Factory in Las Vegas Saturday.

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Melissa Rycroft, Tye Strickland and Ava Grace

Welcome to Bedrock! The Bachelor alum and her family dressed up as the Flinstones for the 18th Annual Dream Halloween party in Santa Monica, Calif. Saturday.

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Kim Kardashian

The buxom brunette wore a curve-hugging Poison Ivy costume when she hosted the Midori Green Halloween Party at Lavo in New York City Saturday.

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Kevin Jonas, Sammi "Sweetheart" Giancola and Danielle Deleasa

The singer and his wife joined the Jersey Shore star at The Pool After Dark at Harrah's Resort in Atlantic City, New Jersey. "We loved dressing up like the Mary Poppins crew," Jonas tweeted.

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Joan Rivers, Kelly Osbourne George Kotsiopoulos and Giuliana Rancic

For E!'s Fashion Police Friday, Rivers morphed into Suri Cruise. Meanwhile, Osbourne vamped it up as J. Lo, Kotsiopoulos played Marc Anthony and Rancic channeled Victoria Beckham.

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Nicole Richie

By impersonating J. Lo at Kate Hudson's bash in Pacific Palisades, Calif. Saturday, Richie honored her pledge to avoid wearing a "slutty" Halloween costume. "Don't be fooled by the rocks dat we got!" she tweeted.

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Sofia Vergara

In a rare instance, the voluptuous Modern Family star covered up her cleavage when she sported an Angry Birds costume on Saturday.

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Matt Lauer and Ann Curry

For Monday's Today, the co-anchors recreated Prince William and Kate Middleton's April 29 wedding at Westminster Abbey. They even shared a kiss on-air!

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Matthew Morrison

Dressed as Roger Rabbit, the Glee star hosted his second annual bing! Halloween bash at Voyeur in L.A. Saturday.

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Holly Robinson Peete

The actress looked just like Lil Wayne at the 18th Annual Dream Halloween party in Santa Monica, Calif. Saturday.

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Colton Haynes

The Teen Wolf star (who wore an Eeyore costume) was flanked by two SVEDKA models at Matthew Morrison's bing! Halloween bash at Voyeur in L.A. Saturday.

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Katie Lee Gifford and Hoda Kotb

Portraying Princesses Beatrice and Eugenie at the royal wedding, Gifford tweeted that she and Kotb "dressed down so as not to draw any attention away from the bride (that slut)."

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Katherine Heigl, Josh Kelley and Naleigh

Heigl looked bewitching when she took her little princess trick-or-treating in L.A. Sunday.

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Kelly Ripa and Nick Lachey

While the Regis & Kelly LIVE! co-host morphed into Eden Wood from Toddlers & Tiaras, the Sing-Off host mocked Charlie Sheen.

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Rachael Ray

The talk show host dressed as Little Red Riding Hood for a themed episode of The Rachael Ray Show.

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Sam Trammell

Love bites! True Blood's Sam Trammell posed with two sexy vampires at Vanity Nightclub inside Las Vegas' Hard Rock Hotel & Casino.

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Beyonce

The busiest "B" of them all -- the expectant singer covered up her bundle of joy in a bumblebee costume as she partied at Monday's Gypsy Halloween event hosted by Kanye West and Anja Rubik in NYC.

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Brooke Shields

She's so good on stage she couldn't break character! The star borrowed her Morticia costume from her Broadway production of The Addams Family for a night of trickery with her family in NYC.

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Jessica Alba and Cash Warren

Dressed in a black floor-length corseted gown and a purple velvet witch hat, the new mom traded in her days at the park with her two little girls for a Wiccan night on the town with her hubby, dressed as a football player.

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Naomi Watts

Hitting the streets of NYC's Soho with beau Liev Shreiber and sons, it was time to clown around for Naomi Watts, dressed in a red and white polka-dot jumpsuit, yellow afro wig, and red rubber nose.

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Jennifer Garner

The pregnant star turned to the darker side as she dressed up in a witch costume, disguising her baby bump in a black dress, purple cape, and topped off in a witch hat.

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Alyson Hannigan & Family

The How I Met Your Mother star kept it simple for herself, but dressed daughter Satyana in a traditional pumpkin costume as they trick-or-treated Monday in LA.

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Fergie

The Black Eyed Peas diva dressed as a Toddlers & Tiaras beauty queen in an outfit designed by Marco Marco for Heidi Klum's Halloween bash at PH-D in NYC.

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Hilary Duff

The actress and singer showed off her pregnant belly as she and husband Mike Comrie disguised themselves as robbers in L.A. this Halloween.

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Zac Efron

He wears short shorts! At Miley Cyrus' weekend bash in Toluca Lake, Calif., the hunk gave everyone something to talk about as he showed off his legs in super short shorts, dressed as a cop from Comedy Central's Reno 911.

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Kourtney Kardashian

As sister Kim flew to Australia after filing for divorce, Kourtney donned knee-high fringed boots as she dressed as Pocahontas to cheer on her little brother Rob at Monday night's Dancing With the Stars taping in LA.