Heidi Klum, Kim Kardashian Headline Celebrity Halloween Costumes

Halloween is a good excuse for kids to dress up and beg for candy and for adults to stretch the outer reaches of their imaginations for Halloween party show-stoppers. In the celebrity world, it's kicked up several notches, as not only do famous folks have even more insane ideas, but they also have the funds to execute them and the forums in which to show them off.

(Click here for more celebrity Halloween costumes, including Kim Kardashian, Heidi Klum, Liv Tyler and Ice-T!)

This year's batch of celebrity Halloween costumes had some great highs and lows, but they were all pretty impressive. Rapper and "Law and Order" star Ice-T hit the red carpet dressed as a sort of post-modern Dr. Frankenstein, and wife Coco was just behind him in one of the most revealing sexy nurse costumes ever constructed (it honestly violated the laws of physics, space and time). Elsewhere at celebrity Halloween parties, Jamie Lee Curtis posed as a cheerleader (she had the varsity letters "CAAF" on her chest, marking her support for the Children Affected by AIDS Foundation), while Tori Spelling donned some feathers for a complicated peacock get-up. Kim Kardashian poured herself into a medieval wench costume — or was she Red Riding Hood or a particularly foxy pirate? It's sort of difficult to discern.

Ashanti went with a sexy cat costume, while Liv Tyler appeared to be dressing up pre-emptively as the Natalie Portman character from the upcoming film "The Black Swan." But undoubtedly this year's costume championship goes to model and "Project Runway" host Heidi Klum, who morphed into ... well, just take a look.

(Click here for more celebrity Halloween costumes, including Kim Kardashian, Heidi Klum, Liv Tyler and Ice-T!)

What's your favorite celebrity Halloween costume? Let us know in the comments!