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Natalie Portman's extreme diet for Black Swan: 'It was challenging'

Like co-star Mila Kunis, Natalie Portman got scary-skinny for her role as a prima ballerina in Black Swan.

In fact, Portman got so thin at one point at that director Darren Aronofsky insisted she eat more.

'REALLY REALLY SKINNY'

"At a certain point I looked at [Natalie's] back and she was so skinny and so cut," Aronofsky tells Access Hollywood. "I was like, 'Natalie, start eating,' I made sure she had a bunch of food in her trailer.

“[Natalie] took [the role] very seriously. These dancers get really, really skinny.”

Like castmate Mila, the petite 5'3" Portman lost 20 pounds, and confessed losing weight was "very challenging physically" and that she stopped working out and carbo-loaded as soon as filming wrapped.

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'I STOPPED DIETING AFTER SHOOTING ENDED'

“The [day after shooting ended] I was like, pasta, pasta, pasta! No working out,” Natalie recounts. “It was pretty immediate. I was ready to leave the ballet life.

"I was like, ‘Please don’t let there be re-shoots for this [film] because I don’t think I could get back into the costumes!’”

In addition to their extreme dieting, Natalie and Mila filmed a sizzling lesbian sex scene, but Kunis insists it wasn't purely for titillation.

“[The scene] has a point to the film,” says Mila. “So, ultimately, if people walk out and that’s all they remember, that’s unfortunate. There’s a reason for it, It’s not just there for shock value.”

[UPDATE: Controversy erupts as Natalie's body double claims Portman only did 5% of dancing in Black Swan]

, Celebrity Fitness and Health Examiner

Samantha Chang is the executive editor and co-owner of TheImproper.com, an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha is a former financial journalist who enjoys running, cycling and music. Contact her at schang@theImproper.com.

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