It's going to be the battle of the summer. Britain's two most beautiful young actresses go head-to-head at the box office with three major films each in the next 12 months.
Keira Knightley has been the film industry's darling so far, but in her latest movie The Edge of Love, she shares equal billing with screen love-rival Sienna Miller.
And film pundits says Sienna out-performs Keira in the Dylan Thomas biopic which is out Friday.
Until now Sienna, 26, has been better known for her lovers than her acting skills and Keira, 23, had cornered the market in swashbucklers and costume dramas.
But industry insiders say that's about to change as the girls go into direct competition.
While Keira plays a succession of "nice girls" in The Duchess, King Lear and My Fair Lady, Sienna's career takes off as she plays Maid Marian with Russell Crowe as Robin Hood in Nottingham, and stars with Robert De Niro in Stone.
Knocking Angelina Jolie off the top action babe spot, Sienna will also star as the high-kicking Baroness in next year's G.I. Joe.
Film critic Mark Adams says: "Since Kate Winslet went quiet there's room for an English actress to make an impact on Hollywood. The smart money's on Sienna."
Not bad for a girl best-known for teaming lingerie with Ugg boots and dating Jude Law.
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SIENNA MILLER
Age: 26 SIZE: 8 HEIGHT: 5FT 5INS FEE: £1m a movie FAMILY: Mum Jo ran drama school, dad Ed's a US banker
Coming Soon: Big roles in Nottingham with Russell Crowe, Stone with Robert De Niro, and G.I. Joe with Brendan Fraser, and Hippie Hippie Shake with Cillian Murphy,
Career Highlights: Sienna took low-key roles for years until she was noticed in Layer Cake and in Alfie with Jude Law in 2004. She won acclaim as Edie Sedgwick in 2006's Factory Girl. Nominated for Rising Star BAFTA this year. She's also modelled for Coca-Cola, Vogue, Prada and Pepe Jeans.
KEIRA KNIGHTLEY
Age: 23 SIZE: 8 HEIGHT: 5FT 7INS FEE: At least £1m FAMILY: Writer mum Sharman Macdonald, actor dad Will Knightley
Coming Soon: Big roles in The Duchess with Ralph Fiennes, King Lear with Anthony Hopkins, My Fair Lady remake with Daniel Day-Lewis.
Career Highlights: Recently voted sexiest movie star of all time, Keira is said to have signed a £500,000 deal to be face of a scent. Pirates movies bagged her a £3m payday, and she got an Oscar nomination for Elizabeth Bennet in Pride and Prejudice and Bafta nomination for Atonement.
