Secret Diary of a Call Girl is a British drama television series that aired from 27 September 2007 to 22 March 2011 on ITV2, based on the blog and books by the pseudonymous Belle de Jour. It stars Billie Piper as Belle, a high-end London call girl.

The series was written by Lucy Prebble, who is also the author of the plays 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.

The series, set in London, revolves around the life of Hannah Baxter (Billie Piper), a young woman who lives a secret life as a call girl, under the pseudonym Belle. The series focuses on her professional and private lives and on complications that arise when these collide. She receives help and advice from her best friend Ben (Iddo Goldberg). In the second series premiere, a new call girl is introduced: Bambi (Ashley Madekwe). Hannah becomes close friends with Bambi and often advises her.

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