Original: Secret Diary of a Call Girl ( known on-air before the watershed in the UK as Secret Diary ) is a British television drama broadcast on ITV2 based on the blog and books by the pseudonymous '' Belle de Jour , '' starring Billie Piper as Belle , a high-class London-based call girl .
Simplified: Secret Diary of a Call Girl ( known on-air before the watershed as Secret Diary ) is a British television drama broadcast on ITV2 starring Billie Piper as Belle , a high-class London-based call girl .