Sienna Miller & Diddy?

Perhaps Sienna Miller is taking a leaf out of her on/off boyfriend Jude Law's book after being snapped cosying up to singer P Diddy last night at Harry O's nightclub in Park City, Utah, where the Sundance Film Festival is currently being held. The 25-year-old actress could be seen talking intently to P Diddy who was wearing his trademark bling jewellery as well as knocking back his tipple of choice - champagne When Miller flew into Utah she was forced to deny reports she had begun a romance with actor Josh Hartnett after the pair were photographed sitting close to each other in Hollywood's Chateau Marmont Hotel last week. The actress has since been braving the cold temperatures in a beanie hat as she promotes her new movie Factory Girl. In it she plays tragic Edie Sedgwick, muse to artist Andy Warhol who is played by Guy Pearce. Source