Piper also starred as Hannah Baxter in Secret Diary of a Call Girl , an ITV2 adaptation of Brooke Magnanti 's The Intimate Adventures of a London Call Girl , a memoir detailing the life of a high-class prostitute who adopted `` Belle de Jour '' as her pseudonym .
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 .