Mila Kunis: Losing 20 Lbs. for Black Swan Was "Fun"

Mila Kunis dropped 20 pounds for her role as a prima ballerina in Black Swan--and she sorta liked it!

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"Transforming your body, in a sadistic way, was kind of fun. In a weird way, I enjoyed the result," the newly single starlet told me last night at the Critics' Choice Movie Awards. "It's amazing what your body can accomplish."

Costar Natalie Portman, who showed her baby bump on the carpet (which we livestreamed), talked about her dramatic weight loss and gain as well:

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After winning the Best Actress award, Nat joked that her fluctuating figure was all director Darren Aronofsky's fault.

"I keep telling Darren, you made me very skinny, and now you're indirectly responsible for making me fat because you introduced me to my love [Black Swan choreographer], Benjamin Millepied, and I am incredibly grateful for that most special of gifts."

Nat and Mila skipped the afterparty, but some stars, including Kyle Richards and E!'s Joan Rivers, were on hand to sip Grey Goose cocktails and enjoy Crumbs cupcakes.

None of which was helping anyone lose 20 pounds.

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