In Black Swan (2010), Natalie Portman underwent an extreme transformation to play the ballerina Nina. She trained intensively in ballet for over a year, practicing five to eight hours a day, even Natalie Portman Makes Surprise Appearance on Stage with Role Model in N.Y.C. No Strings Attached DVD Natalie Portman Ashton Kutcher Romantic Comedy Natalie Portman surprised fans at her Good Sex co star Role Model's concert last night. Natalie Portman On Being Sexualized As A Teenager Natalie Portman Flaunts Her Toned Arms And Legs At Thor Premiere