Sienna Miller is secretly dating her 'Factory Girl' co-star Will Carter. The 25-year-old actress and American actor Will, 38, reportedly grew close after sharing a steamy love scene in the film, which focuses on the tragic life of Andy Warhol's muse Edie Sedgwick.A movie insider told Britain's The Sun newspaper: "Sienna is naturally very flirty and couldn't keep her hands off Will. "They seemed to really get on and have seen each other whenever they can, usually in Los Angeles. She says Will is really sweet." Little-known Will hasn't been acting long. He previously worked as the press secretary to US Senator John Warner but quit to try his luck in movies. His biggest role so far was in 'Running with Scissors, in which he appeared alongside Gwyneth Paltrow.He and Sienna have been seen together at Los Angeles' exclusive Chateau Marmont Hotel where Will once worked in guest relations. Sienna recently told friends she was ready to move on from ex-love, Jude Law.
The pair had shared an on/off relationship ever since Jude, 34, confessed to the blonde actress that he had been having an affair with his children's nanny.
The couple finally confirmed they'd split for good last year, while Sienna was in the US filming 'Factory Girl', in which she plays lead character Sedgwick.