Breakthrough: playing a Londoner in the US television series Keen Eddie.

Biggest film: Casanova, starring opposite Heath Ledger.

She was born in America, but relocated to England once her parents divorced.

Sienna is currently working on Casanova with Heath Ledger.

Sienna dated English model Calum Best when she was 16 years old (he was 17 at the time). They enjoyed writing each other love letters.

She also dated model David Neville for two years (2001-2003).

After starring in Alfie together, Sienna and Jude Law became romantically involved and bought a small apartment in New York City together.

Sienna had a guest-starring role on the short-lived The American Embassy, which was a mid-season filler show that aired in the Ally McBeal time slot.

Sienna modelled for the 2003 Pirelli Calendar.

Sienna once mistakenly called Kevin Spacey "Kevin Bacon."

Sienna dated fellow-Brit actor Orlando Bloom in 2001. They are still good friends.

Elizabeth Hurley insulted Sienna's new short-style hairdo in October 2005 saying, "That's the thing about valuing trends above sexiness. It exposes your flaws. That cut exposes the poor girl." They are good friends now.

Sienna reportedly had an affair with Jude Law's friend Daniel Craig, after Jude confessed he'd had an affair with their nanny. Sienna and Jude have are back together now.

Sienna starred in Shakespeare's As You Like It at Wyndham's Theatre in London until September 17, 2005.

Dogs: Porgy & Bess