British actress Keira Knightley has difficulty keeping movie props intact when she is on set - and often breaks crucial items during filming. The 22-year-old beauty was devastated when she broke both an exclusively designed Chanel necklace and a lighter while shooting period drama Atonement. She says, "I was wearing a Chanel necklace and it got stuck. "No one could budge it. We had to phone Chanel to ask if we could just break it. By this time the filming had come to a complete standstill. "I also had to light a cigarette and lighters always break for me on filmsets. At this particular moment the lighter had broken for about the millionth time so I'm actually going 'F**k, F**k,F**k!'"