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The Best and Worst Celebrity Halloween Costumes of 2011

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Getty Images, Flynet Pictures, Pacific Coast News, Bauer Griffin
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From Kim Kardashian as Poison Ivy to Heidi Klum's skinless bodysuit, we've captured the creativity of Hollywood's hottest on Halloween! Once a year celebs get goofy as they channel their dark sides, youthful sides or simply parody each other. Check out the best and worst of the celebrity costumes.