Celebrities Dress Up For Halloween 2011 (PHOTOS)

Halloween is today, but that didn't stop celebrities from dressing up and hitting some spooky festivities over the weekend.

From Kim Kardashian's Poison Ivy outfit and Lea Michele's "Black Swan"-inspired costume to Gwen Stefani's royal garb and Heidi Klum's, uh, muscular look, celebrities certainly didn't hold back this Halloween.

Check out the photos below and let us know which costume you like the best!

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• Kelly Ripa & Nick Lachey

  Kelly Ripa and Nick Lachey dress up as Kim Kardashian and Kris Humphries on their wedding day outside of Regis and Kelly show in NYC

• Nicole Richie

  Nicole Richie channels her inner J.Lo Saturday night before heading out to Kate Hudson's Halloween party.

• Amber Riley

  "Glee" star Amber Riley channeled her inner Nicki Minaj for Halloween this year.

• Alan Cumming

  Actor Alan Cumming (L) and guests attend Alan Cumming's Halloween party at the Soho Grand Hotel on October 29, 2011 in New York City. (Photo by Neilson Barnard/Getty Images)

• Chris Colfer

  "Glee" star Chris Colfer got into the Halloween spirit with a sea monkey costume.

• Chaz Bono & David Arquette

  "Dancing With The Stars" pals Chaz Bono and David Arquette stop by Kate Hudson's Halloween party Saturday night.

• Emma Roberts

  Emma Roberts attends Kate Hudson's Halloween Bash Saturday night.

• Jessica Alba

  Jessica Alba attends Kate Hudson's Halloween bash Saturday night.

• David Spade & Sarah Silverman

  David Spade tweeted this "Human Centipede"-inspired outfit he made with Sarah Silverman.

• Snooki

  Nicole "Snooki" Polizzi hosts a spine-chilling halloween bash at the Pure Nightclub at Caesars Palace on October 29, 2011 in Las Vegas, Nevada. (Photo by Isaac Brekken/WireImage)

• Heidi Klum

  Heidi Klum arrives at her 12th Annual Halloween Party at TAO Nightclub at The Venetian on October 29, 2011 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

• Kim Kardashian

  TV personality Kim Kardashian attends the Midori Green Halloween costume party at Lavo on October 29, 2011 in New York City. (Photo by Bennett Raglin/WireImage)

• Lea Michele

  "Glee" star Lea Michele dresses up as the White Swan from "The Black Swan."

• Gwen Stefani

  Gwen Stefani dressed up as a Princess for Halloween costume party at Beverly Wilshire Hotel (Splash News)

• Bridget Marquardt

  Model and television personality Bridget Marquardt attends the Gallery Nightclub at the Planet Hollywood Resort & Casino on October 29, 2011 in Las Vegas, Nevada. (Photo by David Becker/WireImage)

• Alex McCord & Simon McCord

  Alex McCord and Simon McCord attend Top of the Rock's 620 Loft & Garden on October 29, 2011 in New York City. (Photo by Eugene Gologursky/WireImage for EMC/Bowery)

• Sofia Vergara

  "Modern Family" star Sofia Vergara is angry...as in an Angry Bird!

• Holly Robinson Peete

  Holly Robinson Peete attends the 18th Annual "Dream Halloween Los Angeles" at Barker Hangar on October 29, 2011 in Santa Monica, California. (Photo by John Shearer/WireImage)

• Zachary Quinto

  Zachary Quinto tweeted a photo of his Halloween costume -- July 4th fireworks -- Saturday night.

• Jamie Lee Curtis

  Actress Jamie Lee Curtis arrives at the 18th Annual 'Dream Halloween Los Angeles' at Barker Hangar on October 29, 2011 in Santa Monica, California. (Photo by Angela Weiss/Getty Images)

• Camille Grammer

  Camille Grammer arrives at the 18th Annual 'Dream Halloween Los Angeles' at Barker Hangar on October 29, 2011 in Santa Monica, California. (Photo by Angela Weiss/Getty Images)

• Ice-T & Coco

  Rapper and actor, Ice-T and wife Coco hosted the "Player's Ball" Halloween party at LAX Nightclub inside the Luxor Hotel & Casino in Las Vegas, Nevada. (Splash News)

• AnnaLynne McCord

  AnnaLynne McCord kicks-off Halloween weekend with 'A Night Of Haunted Seduction' at Pure Nightclub at the Caesars Palace Hotel and Casino in Las Vegas, Nevada.

• JWoww

  Jenni "JWoww" Farley from "Jersey Shore" will host the internationally renowned 'Pimp N Ho Costume Ball' at Chateau Nightclub & Gardens at the Paris Hotel in Las Vegas.

• Kelly Ripa & Nick Lachey

  Kelly Ripa and Nick Lachey dress as a girl from 'Toddlers & Tiaras' and Charlie Sheen outside of the 'Regis & Kelly' show in NYC