Actor Natalie Portman, who won the Best Actress Oscar for her performance in Darren Aronofsky's "Black Swan", has said she was surprised by final look of the film. The 37-year-old actor told Vanity Fair that she thought she was shooting for a "documentary style" feature when she acted in the film and never imagined that it would be an "over the top thriller".

"When I saw the final cut I was completely surprised by what the movie was like. I thought we were shooting something like almost documentary style, and then I watched it and it was an over the top thriller," Portman said. "It was an amazing wake-up call that film is a director's medium and as an actor you have no idea what's going on and you're being led and shaped," she added.