"Of the full body shots, I would say 5 percent are Natalie," says Sarah Lane, 27, an American Ballet Theatre soloist. "All the other shots are me." Lane performed most of the film's complicated dance sequences and allowed Portman's face to be digitally grafted onto her body.

In a L.A. Times article published earlier this week, Portman's fiancé and 'Black Swan' choreographer Benjamin Millepied said otherwise. "There are articles now talking about her dance double [Lane] that are making it sound like [she] did a lot of the work, but really, she just did the footwork, and the fouettés, and one diagonal [phrase] in the studio," he said. "Honestly, 85 percent of that movie is Natalie."

But Lane doesn't agree. "The shots that are just her face with arms, those shots are definitely Natalie," she said. "But that doesn't show the actual dancing."

Lane confessed she was never promised specific billing for her role but was disappointed to see herself barely credited: she is only acknowledged as "Hand Model," "Stunt Double," and "Lady in the Lane" (a brief walk-on role).

One of Lane's most blabber mouth moments was that 'Black Swan' producer Ari Handel asked her not to talk about her work to the press. "They wanted to create this idea in people's minds that Natalie was some kind of prodigy or so gifted in dance and really worked so hard to make herself a ballerina in a year and a half for the movie, basically because of the Oscar," Lane said.