Sienna Rose Diana Miller is an American-born British actress. Born in New York City and raised in London, she began her career as a photography model, appearing in the pages of Italian
Vogue and for the 2003 Pirelli Calendar. Her acting breakthrough came in the 2004 films
Layer Cake and
Alfie. She subsequently portrayed socialite Edie Sedgwick in
Factory Girl (2006) and author Caitlin Macnamara in
The Edge of Love (2008), and was nominated for the BAFTA Rising Star Award in 2008. Her role as The Baroness in
G.I. Joe: The Rise of Cobra (2009) was followed by a brief sabbatical from the screen amid increased tabloid scrutiny.