Miller role played with Pearce

British actress Sienna Miller has revealed how she perfected her role as Edie Sedgwick in Factory Girl - she constantly stayed in character with co-star Guy Pearce.

The Alfie star, who plays artist Andy Warhol's muse in the film, claims she and Pearce got on brilliantly from the start.

Miller, 25, says: "We really adored each other - we got on so well.

"We met in New York last year to go through the script with the director and we had a couple of nights when we'd put on the make-up and run around the hotel, being Edie and Andy.

"Then when I got back to London, Guy would call me and say: 'Edie, it's Andy,' and we'd have conversations in character - it was so much fun."