"Brokeback Mountain" co-stars Heath Ledger and Michelle Williams will reunite in the Bob Dylan biopic "I'm Not There."

According to The Hollywood Reporter, Ledger will play a character originally slated for Colin Farrell, while Williams will play Coco Rivington, a model.

Seven actors including Christian Bale, Julianne Moore and Richard Gere have already signed on to play roles that will represent different aspects of Dylan's life and music.

Todd Haynes ("Far From Heaven") will direct the film, with shooting to begin in Montreal in July.

Ledger will next appear on the big screen in "Candy," as a poet who falls in love with an art student, while Williams is set to play 19th century British author Charlotte Bronte in the biopic, "Bronte."