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 (06) 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."