Vincent Cassel, Winona Ryder & Barbara Hershey have signed on to star opposite Natalie Portman & Mila Kunis in Darren Aronofsky the supernatural dance thriller 'Black Swan.'The movie follows a New York City ballet dancer (Natalie Portman) who is competing for a spot left by a departing dancer (Ryder). She and a rival (Mila Kunis) find themselves in an escalating competition for the approval of the troupe director (Cassel).
But the there is doubt as to whether Kunis character is real or not?
