Sienna Rose Miller is an American-born English actress, model, and fashion designer, best known for her roles in Layer Cake, Alfie, Factory Girl, and G.I. Joe: The Rise of Cobra.She appears in the forthcoming film Hippie Hippie Shake a new Working Title production which also stars Cillian Murphy and, as of September 2009, is playing the title role in Patrick Marber's After Miss Julie on Broadway.Miller was set to play Maid Marian in Ridley Scott's upcoming film Nottingham, featuring Russell Crowe as Robin Hood, but she was dropped from the production before filming began.