Portman will bare all in the biopic on Spanish painter Francisco Goya in which she plays the artist's muse, who is accused of atheism and then stripped as torture.
At the time the actress denied the raunchy movie was a way of shedding her childlike Princess Amidala persona from Star Wars.
She said, "I don't do it in order to prove something. I just go on with my life and do what feels right."
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