Margot Robbie is in talks to star in the Quentin Tarantino's new movie. The new film is entitled 'Once Upon a Time in Hollywood.' Robbie is one of Hollywood's most bankable stars. She could play Sharon Tate in the much-anticipated new movie. Set in LA in 1969, the film is about Charles Manson. Members of Manson's inner circle murdered Tate and several others.