Secret Diary of a Call Girl is a British television drama broadcast on ITV2 from 2007 to 2011 based on the blog and books by the pseudonymous "Belle de Jour," starring Billie Piper as Belle, a high-class London call girl.
The series was written by Lucy Prebble, who is also known as the author of The Sugar Syndrome and ENRON. The series has been compared to Sex and the City by many critics, mainly due to its humorous approach to sex.