Billie Piper stars in the hit series Secret Diary of a Call Girl, based on the real-life adventures of a high-class London escort. By day she's quiet and unassuming Hannah. But when night comes, she's Belle, the city's finest call girl. Juggling her own reality with her clients' fantasies can be difficult, but this savvy sweetheart knows every trick for doing it in style. Take a peek into Secret Diary of a Call Girl,, the witty and provocative original series from Showtime. It's a good time you won't soon forget.