There’s plenty of critical buzz for Darren Aronofsky’s Black Swan, both for the movie itself and Natalie Portman’s performance. However it’s not just Natalie’s acting that’s impressive, it’s her dancing, as she did most of the ballet in the movie herself. She’s had lesson on-and-off since she was a child, but Black Swan involved six months of intensive training to get her ready for the role. It was quite a commitment, which she discusses in a new featurette that’s now online. In Black Swan, Portman plays Nina, a ballerina whose career seems to be taking off, but who develops a rivalry with fellow dancer, Lily (Mila Kunis), which threatens to destroy both her career and her sanity. While Nina is the personification of Swan Lake’s White Swan, Lily is more the dark side of the Black Swan. Click below to see the new featurette, The film hits UK cinemas on January 21st, 2011.