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.
Studied drama at the Lee Strasberg Institute in New York.
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, Berkshire.
Her birthday is one day before that of ex-boyfriend Jude Law.
She was born in the USA but raised in the UK.
Met boyfriend Jude Law when they made the movie Alfie (2004) together.
Named her two dogs Porgy and Bess after the two leading characters in Gershwin's opera of the same name.
Became engaged to Jude Law on Christmas Day, 2004.
Studied acting with Michael Margotta.
Jude Law publicly apologized for cheating on her with nanny Daisy Wright. [July 2005]
In the summer of 2005, she made her West End debut in the stage production of William Shakespeare's "As You Like It", directed by David Lan, at the Wyndham Theatre. She played the role of Celia.
Ended her seven-month engagement with Jude Law. [Late July 2005]
Her sister celebrates her birthday two days after Sienna's.
Named #48 on the Maxim magazine Hot 100 of 2005 list.
Named #2 in AskMen.com's Top 99 Most Desirable Women
Ranked and Voted #2 by AskMen.com's Top 99 Most Desirable Women of 2006
Friend of Keira Knightley.
She and co-star Hayden Christensen shared a house during the filming of Factory Girl (2006) in Louisiana.
#42 on maxims hot 100 of 2006
Lost out on the role of "Lureen Twist" in Brokeback Mountain (2005) to Anne Hathaway.
Named #63 in FHM magazine's "100 Sexiest Women in the World 2006" supplement. (2006).
Broke up with Jude Law, again [November 13, 2006].
Fan of Chelsea FC (England football club).
Told "The Daily Telegraph" newspaper in February 2007 that she has tried to quit smoking, but "it's so hard.".
Replaced Lindsay Lohan for the role of Caitlin MacNamarra in The Edge of Love (2008) starring alongside her close friend Keira Knightley.
Ranked #11 on the Maxim magazine Hot 100 of 2007 list.
Was named "Film Actress of the Year" at the 2007 Glamour Women Of The Year Awards.
Ambassador for Global Cool.
Sister of Savannah Miller, a graduate of the prestigious Central St. Martins Design School.
Good friends with Anne Hathaway.
Received an unprecedented $75,000 settlement when a British court ruled that British tabloids the "Sun" and the "News of the World" had violated her invasion of privacy rights. The tabloids had covertly photographed Miller doing a nude scene in the production Hippie Hippie Shake (2008), and later published the pictures without prior permission. [2007]
Good friends with Guy Pearce.
Though New York-born, Miller grew up in south-west London's Parsons Green district.
Sharing a house with Welshman Rhys Ifans in London's St. John's Wood district. [2008]
Mother Jo Miller worked for David Bowie for a spell during the 1970s.
Ranked #27 on the Maxim magazine Hot 100 of 2008 list.
Broke off her engagement to Rhys Ifans. [June 2008]
Rhys Ifans had to ask her three times to marry him before she finally said "yes".
Vacationed with boyfriend Balthazar Getty in Italy's Amalfy Coast. [July 2008]
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Sienna Miller was born on December 28, 1982 in New York. Her father is American Banker Ed Miller and her mother Jo Miller taught at London's Lee Strasberg drama school. She has a sis Savannah, two half-brothers called Charles and Stephen and a stepsister, Natasha. Sienna went to a boarding school in Ascot, Surrey and developed a passion for film as well as training as a singer, and doing a bit of modeling. After school it was back to New York to study acting full time at the Lee Strasberg Institute and appeared in a few NY productions. Sienna secured a top UK agency to hunt down roles for her and she appeared in the BBC series Bedtime. This led on to 'Keen Eddie', and she has reportedly signed a seven-year film deal with Paramount Pictures! While in the UK, Sienna lives in Notting Hill.