: Sienna Miller is a British-American actress and model born on December 28, 1981, in New York City, raised in London. She trained at the Lee Strasberg Theatre and Film Institute. She is known for her roles in Alfie, Factory Girl (as Edie Sedgwick), G.I. Joe: The Rise of Cobra, American Sniper, Foxcatcher, The Lost City of Z, and Anatomy of a Fall. A prominent figure in 2000s fashion, she defined the boho-chic aesthetic and remains one of Britain's most stylish public figures.