Fox Searchlight is in final negotiations to co-finance and distribute Darren Aronofsky's supernatural thriller Black Swan, set in the world of New York ballet.

According to The Hollywood Reporter, Cross Creek Pictures would now co-finance the picture with Searchlight; Rick Schwartz's Overnight Films had been co-financing, though Schwartz will remain involved with the project. As part of the new financing arrangement, Cross Creek topper Brian Oliver is set to come aboard as a producer.

The pic, which stars Natalie Portman and Mila Kunis, has also rounded out its cast. Winona Ryder has signed on to play an older dancer to Portman's and Kunis' younger performers, while Barbara Hershey and French actor Vincent Cassel are also joining the cast.

Production is scheduled to start in New York before the end of the year, with a budget estimated to be $10 million-$12 million.

Black Swan centers on a young dancer at the New York City Ballet (Portman) who may or may not be having delusions about a rival dancer (Kunis). The project, which began life at Universal before being reconceived as an indie, has drawn comparisons to The Others and other high-end supernatural thrillers.

Black Swan was released December 3rd, 2010 and stars Natalie Portman, Mila Kunis, Vincent Cassel, Barbara Hershey, Winona Ryder, Benjamin Millepied, Ksenia Solo, Kristina Anapau. The film is directed by Darren Aronofsky.