Sienna Rose Miller (born December 28, 1981) is a British/American actress, model, and fashion designer, best known for her roles in Layer Cake, Alfie, Factory Girl, The Edge of Love and G.I. Joe: The Rise of Cobra. In 2007, the London Film Critics named her British Actress of the Year for Interview. In 2006, she designed a fashion capsule for Pepe Jeans.
Born in New York City, Miller moved to London with her family when she was just over a year old. Her father, Edwin Miller, is an American banker turned dealer of Chinese art. Miller has a sister, Savannah and two half-brothers, Charles and Stephen. Miller attended Heathfield St Mary's School, a boarding school in Ascot, Berkshire, and later studied for a year at the Lee Strasberg Institute in New York City. She carries both British and American passports, and acquired her first driving licence in the US Virgin Islands, since it was easy to qualify, which allowed her to drive in both the US and UK.
Prior to her professional acting career, Miller worked as a photographic model. She signed with Tandy Anderson of Select Model Management London, and modeled for Coca-Cola, Italian Vogue, and posed topless in the 2003 Pirelli Calendar.