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Natalie Portman's "Black Swan" Trailer Debuts Online

Natalie Portman in "Black Swan" (Fox Searchlight)

NEW YORK (CBS) Based on the first trailer for "Black Swan," which debuted online Tuesday, it's safe to say that the ballet-themed flick will not be your average dance movie.

In the Darren Aronofsky-directed thriller, Natalie Portman stars as Nina, a rising star in the New York City ballet scene who's given the lead role in her company's production of "Swan Lake." Her position is threatened when a new dancer, Lily, played by Mila Kunis, enters the picture.

As the two develop a twisted relationship, Nina's life pirouettes out of control and is left to face a daunting question. Is her rival Lilly even real or just a delusion?

The last scene of the trailer provides a curiously chilling end as Portman pulls a tiny black feather from a wound on her back.

"Black Swan" also stars Vincent Cassel ("Ocean's Twelve"), Barbara Hershey ("The Last Temptation of Christ") and Winona Ryder.

The film is slated for a Dec. 1 release, but will first premiere on the opening night of this year's Venice International Film Festival on Sept. 1.

Watch the trailer below.