British actress Billie Piper accidentally revealed her breasts on the set of her new TV movie SECRET LIFE OF A CALL GIRL. The former Dr Who star - who plays a prostitute in her latest role - claims she suffered her "most embarrassing" moment during filming. She says, "Being on set, surrounded by the crew, while I was making Secret Diary and having someone politely inform me that one of my boobs had popped out of my PVC outfit was probably the worst!"