Sienna Rose Diana Miller (born 28 December 1981) is an American-born British actress, model and fashion designer. In 2008, she was nominated for the BAFTA Rising Star Award, while for her role as Tippi Hedren in the 2012 TV film The Girl, she was nominated for a BAFTA TV Award for Best Actress and a Golden Globe Award for Best Actress. Her film roles include the crime thriller Layer Cake (2004), the comedy Alfie (2004), the biopic Factory Girl (2006), the drama The Edge of Love (2008), the military science fiction action film G.I. Joe: The Rise of Cobra (2009), the biographical drama Foxcatcher (2014) and the biographical action film American Sniper (2014).