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Kim Kardashian dresses as Poison Ivy as she celebrates Halloween two days early by hosting the Midori Green Halloween Party at Lavo in New York City.

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Another shot of Kim in her Poison Ivy costume. Kardashian was accompanied by her pal Jonathan Cheban, who was dressed as Batman's sidekick, Robin.

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Miranda Kerr hosts her Sexy Circus Halloween Party at the Catch Rooftop in New York.

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Paul "Pauly D" DelVecchio attends the Pacha Halloween party in New York.

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"How I Met Your Mother" star Alyson Hannigan and her husband take their daughter, Satyana, trick-or-treating on Halloween in Santa Monica, Calif.

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Naomi Watts takes her kids trick-or-treating in Lower Manhattan.

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Heidi Klum and Seal attend Heidi Klum's 12th annual Halloween party at PH-D at the Dream Downtown in New York.

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Model Amber Rose dons a Slash costume for Heidi Klum's 12th annual Halloween party.

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Carrie Keagan attends Heidi Klum's Halloween bash.

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Russell Simmons and Andre Harrell pose on the red carpet before heading into Heidi Klum's Halloween party in New York.

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Phillipe Blond and David Blond of fashion duo The Blonds make an appearance at Heidi Klum's spooky soiree.

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Byrdie Bell dresses up as a butterfly for Heidi Klum's party.

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Kyle MacLachlan was also in attendance at Heidi Klum's party.

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Model Jessica White attends Heidi Klum's party.

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Actress Michelle Trachtenberg attends Heidi Klum's annual Halloween bash.

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"Jersey Shore" star Vinny Guadagnino channels Derek Zoolander at Heidi Klum's party.

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Tyson Beckford attends Heidi Klum's 12th annual Halloween party.

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Models Chrissy Teigen and Kate Upton attend Heidi Klum's annual Halloween party in New York.

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Fergie dresses as a "Toddlers & Tiaras" princess for Heidi Klum's Halloween bash.

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Socialite Paris Hilton is decked out in a heroine outfit as she leaves a Halloween party in Los Angeles

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Nick Lachey guest hosts "Live! with Regis and Kelly"with Kelly Ripa, and they dress up in two different costumes. Ripa dresses first as one of the "Toddlers in Tiaras," and Lachey goes as Charlie Sheen.

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Ripa and Lachey then dress up as Kim Kardashian and Kris Humphries.

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"Today" co-anchors Matt Lauer and Ann Curry dress as Prince William and Kate Middleton on their wedding day.

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"Real Housewives of New Jersey" star Teresa Guidice attends a Halloween party at the Top of the Rock's 620 Loft & Garden.

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Alessandra Ambrosio dresses up for Halloween as she takes her daughter trick-or-treating.

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Giada De Laurentiis dons a Katy Perry costume.

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"Boardwalk Empire" star Gretchen Mol, dressed as Raggedy Ann, goes to a Halloween party in the West Village with her family.

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Belle of the ball: Gwen Stefani is dressed up as a Princess for Halloween costume party at Beverly Wilshire Hotel in Los Angeles.

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Actress Debra Messing and hejr husband David Zelman get ghoulish for Bette Midler's Hulaween event in New York City.

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Me-oww! Nicky Hilton dresses as a leopard for a Halloween party in Los Angeles.

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What a party animal! Nicole "Snooki" Polizzi shows her wild side while hosting at Pure night club inside the Caesars Hotel in Las Vegas.

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She's earned it: "Halloween" star Jamie Lee Curtis leaves the scary stuff behind with a Little Red Riding Hood outfit at 18th Annual Dream Halloween benefitting the Children Affected by AIDS Foundation in Santa Monica, Calif.

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He might bite: Rapper and actor Ice-T and wife Coco host the "Player's Ball" Halloween party at LAX Nightclub inside the Luxor Hotel & Casino in Las Vegas.

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Musicians and sisters Amanda and Alyson Michalka strut their stuff at Kate Hudson's Halloween costume party.

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What a couple of stiffs! Alex McCord and Simon McCord at Top of the Rock's 620 Loft & Garden in New York City.

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Heidi Klum always goes all out for Halloween. This year, her elaborate costume included being rolled in to her Halloween party at Tao in Las Vegas on a gurney by 2 men dressed as doctors.

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Here, Klum's "doctors" pull back the sheets to reveal her elaborate costume.

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Klum's full corpse costume

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She's alive!

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...and standing.

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Earlier in October, Klum got fitted for her costume.

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Bethenny Frankel also attended Klum's Vegas Halloween party, dressed in a "Hello Kitty" costume.

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Katherine Heigl wears a witch costume as she and her husband Josh Kelley dress their adorable daughter Naleigh in a princess costume for a Halloween party.

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David Arquette leaves a Halloween party in Los Angeles dressed as a pimp.

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Camille Grammer dresses as a pirate for the 18th Annual Dream Halloween benefitting the Children Affected by Aids Foundation and Keep a Child Alive at the Barker Hanger in Santa Monica.

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Jersey Shore star Jenni "JWoww" Farley loves vodka so much that she's dressing as a 'vodka robot' for Halloween.

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Tila Tequila attends Bel-Air Gets Naked For Halloween Charity Event in Los Angeles, Calif.

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Quoth the raven, nevermore. Heidi Klum and Seal dressed as crows in 2009.

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In 2008, Heidi Klum went as Shiva, the many-armed Indian goddess of destruction. Not only did her costume involve eight arms -- but it also incorporated many severed heads and skulls.

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Julianne Moore with her daughter Liv Helen dressed as a leprechaun trick or treating on Halloween in the West Village in New York.

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Tori Spelling dressed as Fairy Princess during a Halloween party at the Barker Hangar in Santa Monica, Calif.

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Audrina Patridge and Corey Bohan attend a Halloween party at The Bank Nightclub, Bellagio Hotel in Las Vegas, Nevada.

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Kim Zolciak of the Real Housewives of Atlanta Trick or Treats in her SVEDKA_GRL Halloween Costume.

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Katrina Bowden dressed as Fairy Princess attends a kick off Halloween weekend costume party extravaganza at the Hudson Hotel in New York City.

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Kim Kardashian dressed as Little Red Riding Hood attends Heidi Klum's 11th Annual Halloween party at Lavo in New York City.

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Dressed in a Little Red Riding Hood costume, Kate Beckinsale, husband Len Wiseman and daughter Lilly go trick or treating on Halloween night in Santa Monica.

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Coco dressed as a nurse attends Heidi Klum's 11th Annual Halloween Party at Lavo in New York.

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Garcelle Beauvais dressed in a pirate costume at Barker Hangar in Santa Monica, California.

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Melinda McGraw on her gym clothes.

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Jadin Gould at Barker Hangar in Santa Monica.

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Stephen Kramer Glickman as a French Fries at Barker Hanga in Santa Monica, California.

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Christine Teigen and musician John Legend attend the Heidi Klum's Halloween Party.

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Melissa George attends the Heidi Klum's Halloween Party.

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Ashanti as a cat attends Heidi Klum's 11th Annual Halloween Party at LAVO in New York.

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Coco and Ice-T attends Heidi Klum's 11th Annual Halloween Party at LAVO in New York.

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Heidi Klum and Seal at Heidi's 11th Annual Halloween Party at LAVO in New York.

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Liv Tyler dressed in black trick or treat on Halloween in the West Village.

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Meredith Vieira dressed as Lady Gaga.

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Al Roker dressed as a Superman.

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Will Ferrell and Tina Fey join the cast of The Today Show for it's annual Halloween celebration.

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LaLa Vazquez dressed as a Sailor.

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Katie Lee attending CBS The Early Show dressed as Cleopatra.

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Gwyneth Paltrow, dressed as a bunny with daughter Apple, go trick or treating in the West Village.

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Marilyn Manson attends Knott's Scary Farm Halloween Haunt at Knott's Berry Farm in Buena Park, Calif.

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Paris Hilton opts for a saucy police woman's outfit as she heads out to a Halloween party.

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Lydia Hearst Shaw makes an appearance at the Halloween Masquerade party dressed as her favorite gossip column.

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Helena Christensen wears a Peruvian outfit as she takes her son Mingus trick or treating in the West Village on Halloween.

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Sophie Monk arrives at an early Halloween party dressed as a sexy ladybug.

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Jamie Lee Curtis, dressed as Circus Ringmaster, walks the red carpet at the Children Affected by AIDS Foundation's Annual Dream Halloween.

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Teri Hatcher and daughter Emerson dress up as as the Queen of Hearts and Alice from Alice in Wonderland.

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Marlee Matlin dresses as a pirate from "Pirates of the Caribbean."

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Rachel Weisz looks lavish in a vibrant red costume.

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Gwen Stefani dresses as an egg.

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Mariah Carey dresses as Famous Amos cookies.

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Matt Lauer and Meredith Viera dress as Luke Skywalker and Princess Leia.

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Heidi Klum dresses as Goddess Kali.

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Matt Lauer as Luke Skywalker.

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La Toya Jackson sports a futuristic Halloween outfit.

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Lady Gaga is always Halloween-fashionable.

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Nick Cannon and Mariah Carey dress as firefighters.

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Bai Ling dresses up as Andy Warhol.

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Paris Hilton dresses up as a sexy sailor for Halloween.

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Taylor Momsen wears a mask as she films a Halloween scene for "Gossip Girl."

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Rachael Ray and John M. Cusimano dress as a Bunny and Jessica Rabbit.

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Playboy Playmate Shauna Sand holds some pumpkins dressed for Halloween.

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Jill Nicolini, PIX morning news traffic reporter, tapes a Halloween segment dressed as a witch.

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Sam Trammell wears a full-body wolf man costume.

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Nicole "Snooki" Polizzi dresses as a giant "missing" milk cartoon.

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Katy Perry dresses like an "angeled egg" and performs a Halloween concert in Charlotte, N.C.

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Lance Bass and Kim Kardashian dress as Wonder Woman and a graduate.

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Heidi Klum dresses as sexy cat.

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Paris Hilton dresses as a sexy ballerina.

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"Octomom" Nadya Suleman heads out with her eight little devils for some Halloween fun.

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James Gandolfini wears a Homer Simpson mask.