British actress Billie Piper was determined to take her new role as a prostitute serious - she met several real life vice girls. The former Doctor Who star plays a hooker in forthcoming British TV show Secret Diary Of A Call Girl. She says, "I met high-class hookers who were very candid. I wanted to know if they get anything out of the sex... if they ever fell in love with the guys. Surprisingly, some of them did."