Sienna Rose Diana Miller was born in New York City, but was raised in London, England. Her father, Edwin "Ed" Miller, who is American-born, is an investment banker and a dealer in Modern Chinese paintings. Her mother, Josephine "Jo" Miller, was a South African model and a personal assistant to David Bowie; she went on to manage the Lee Strasberg Theatre and Film Institute in New York City, and then became a yoga instructor. Sienna has one older sister, Savannah Miller.The family moved to Chelsea, London, when Sienna was 18-months-old. Sienna spent her weekends horse riding at her godmother's farmhouse in Wiltshire. When Sienna was age 6, her parents got divorced. Sienna and Savannah moved to Parsons Green with their mother, who was also being treated for breast cancer. Sienna's father remarried three times and moved to the Virgin Islands. At age 8, she moved away to Heathfield boarding school in Ascot, where she enjoyed playing Lacrosse and acting.Sienna went back to New York City, whe