Real Name: Sienna Rose Miller
Hair: Medium Blonde
Born: Born on December 28, 1981 in New York, New York, USA.
Discovered: Raised in England, Sienna moved back to the U.S. to study drama at the Lee Strasberg Institute in New York. She first came on the scene with a role in the 2001 romantic-comedy, South Kensington.
Resume: Sienna got a bigger role in 2002's High Speed, about the life and adventures of a motorbike rider.
Leaving the big screen behind Sienna starred in the TV series "Bedtime" in 2002, and in another TV series "Keen Eddie" in 2003.
In 2004 Sienna took a role in the thriller, Layer Cake. But it was her 2004 role in Alfie, where she met fiance-to-be Jude Law, that finally brought Sienna into the spotlight.
Sienna recently starred in William Shakespeare's "As You Like It", directed by David Lan, at the Wyndham Theatre.
Sienna is set to star alongside Heath Ledger in Casanova, and is working on several films to come.
Known For: Her relationship with actor Jude Law.
Romance: Became engaged to Jude Law on Christmas Day, 2004, the engagement ended in July 2005 after he was caught cheating with his son's nannie.
Quotes: "I know people compare me to Kate [Moss] a lot after that media hype started. But itÂ´s not that IÂ´m trying to get her look, truly not. But I like what sheÂ´s wearing and we seem to share taste to a certain extent." - Sienna Miller.
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"I'm English, definitely. I don't feel like I'm American in any way." - Sienna Miller.
"I'm very happy about it to be really honest! But I think it's as a result of being scrutinised because of the relationship that I'm in (with then-boyfriend Jude Law). If it was because of the work, it would be more justified." - Sienna Miller on her newfound fame.
"Men's traditional view of sexiness isn't sexy. It shouldn't be so obvious: push-up bras and miniskirts? Sexiness, to me, is when people are comfortable with themselves." - Sienna Miller.
"I've wanted to be an actress for as long as I can remember, and I can say I was almost born in the theatre. My mum went into labour while she was watching the Nut-Cracker Suite in New York - apparently I was kicking like mad" - Sienna Miller.
Trivia: One sister, Savannah, two half-brothers, Charles and Stephen and a step-sister, Natasha.
Her mother, Jo Miller, ran London's Lee Strasberg drama school.
For more than a decade her father, American Banker Ed Miller, was married to top interior designer Kelly Hoppen.
Was educated at Heathfield School in Ascot, Surrey.
Her birthday is one day before that of ex-fiance Jude Law.
Named her two dogs Porgy and Bess after characters in an opera.