Piper stars in "Secret Diary of a Call Girl", an ITV2 version of Belle de Jour's "The Intimate Adventures of a London Call Girl", a memoir detailing the life of a high-class prostitute. The series, which aired from 27 September 2007, saw Piper in several semi-nude scenes, including a lesbian romp and one scene featuring her saddling a client and riding him like a horse. A second series, with Piper in the starring role, started filming in May 2008, during which two body doubles were hired in order to effectively hide Piper's pregnancy.