Mila Kunis restricted her eating habits immensely when starring in the psychological thriller “Black Swan.”

“My prep was a lot of dancing and very little eating — which I know you’re not supposed to say, but it’s the truth,” the actress told Vogue in a joint interview with her co-star in the 2010 film, Natalie Portman.

“I drank a lot of broth and danced for 12 hours a day,” she added in the piece published Friday.

Kunis, now 42, added that she and Portman — who played professional ballerinas — only expected to have three months to prepare for their dance intensive roles.

However, after producers lost some financing, the project “got extended to six months while Darren [Aronofsky, the film’s director] tried to find money.”

“It sucked for Darren, but Nat and I were so happy because we

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