Filming 2010’s horror film Black Swan took a lot out of the movie’s stars, Mila Kunis and Natalie Portman.

“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,” Kunis explained in a joint Vogue interview with Portman published on Friday, August 15. “I drank a lot of broth and danced for 12 hours a day.”

The That 70’s Show actress was 27 at the time of filming.

“We were only supposed to have three months of prep before filming started, but we lost some financing, so that got extended to six months while [director] Darren [Aronofsky] tried to find money,” she elaborated. “It sucked for Darren, but Nat and I were so happy because we had three extra months to dance.”

Portman also noted that other than learning to dance, there w

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