The story goes that Sienna was almost born in a theater. Her mother went into labor while watching the Nutcracker Suite. Sienna moved to England when she was a little over a year old, but she holds both English and American passports.
Before becoming an actress, Sienna was a model for Coca-Cola, Italian Vogue and she posed topless in a Pirelli Calendar. She told The Times, As an actress I feel that if you start to impose your inhibitions, then you are not doing your job. And Im fascinated by people who are extroverted, so I guess Ive got a lot more nudity to come.
She was also the ambassador for the Hugo Boss perfume BOSS Orange.
Sienna Miller made her film debut in South Kensington and the TV drama series Eddie. Other roles followed, including parts in Alfie, Layer Cake, Casanova, Stardust, The Mysteries of Pittsburgh, The Edge of Love and G.I. Joe: The Rise of Cobra, among others.
She has been a regular on Sexiest lists, including Maxim, FHM and AskMen.com.
Sienna Miller has been the Global Ambassador for International Medical Corps and an ambassador for the UK branch of the Starlight Childrens Foundation.
Aside from her acting career, Sienna Miller may be more known for her dating history and penchant for scandal, including dating a married Balthazar Getty. Regarding Getty, she said, It was like, I well, I experienced the judgment of a lot of people and deservedly so. But she did agree it would be different if she were a man. Its difficult being a woman in this in any business. I dont think we live in a particularly equal society. But sometimes thats down to our own behavior (guardian.co.uk).
In 2006, Sienna Miller referred to Pittsburg as Shitsburgh, which forced her to issue an apology. She also admitted to using drugs. I still love the odd hallucinogenic drug.I took a morphine pill just to feel what a safe way of taking morphine was like. I didnt really feel a lot. Im incredible hardcore (digitalspy.com).
Sienna Miller admitted later, I think Id like to protect myself a little bit better because the repercussions are often quite upsetting the repercussions of my own mouth upon myself and I get bollockings. Its just a lot of drama for, you know, I could keep my opinions to myself, or share them with people who arent writing them downbut Im notI try, but Im not very good at it.
Sienna Miller gave birth to a daughter, Marlowe Ottoline Layng with her partner, Tom Sturridge.