Question: The identity of the author of The Intimate Adventures of a London Call Girl was revealed in what year?

Context paragraphs:
Ashley Madekwe: Ashley Madekwe (born 6 December 1983) is an English actress.  She is known for her roles as call girl Bambi in the ITV2 series "Secret Diary of a Call Girl", social climber Ashley Davenport on the ABC drama series "Revenge" and the witch Tituba in the WGN America series "Salem".

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

Ashley Alexandra Dupré: Ashley Rae Maika DiPietro (born Ashley Youmans; April 30, 1985) better known by the stage name Ashley Alexandra Dupré, is a former call girl.  She has worked as a sex columnist for the "New York Post", and as a singer.  She became a public figure when it was disclosed that she was the woman at the center of the Eliot Spitzer prostitution scandal.  In that capacity, she was known as Kristen, the name she used as a call girl.

The Intimate Adventures of a London Call Girl: The Intimate Adventures of a London Call Girl are memoirs of a former London call girl written by Dr. Brooke Magnanti, under the pseudonym "Belle de Jour".

List of Secret Diary of a Call Girl episodes: "Secret Diary of a Call Girl "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 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.  The third series began on 28 January 2010, on ITV2.  The fourth and final series began on 1 February 2011, on ITV2.

Confessions of a Brazilian Call Girl: Confessions of a Brazilian Call Girl (Portuguese: Bruna Surfistinha – "Bruna Little Surfer Girl") is a 2011 Brazilian drama film directed by Marcus Baldini, based on the novel "The Scorpion's Sweet Venom: The Diary of a Brazilian Call Girl" by Raquel Pacheco.  Starring Deborah Secco and Cássio Gabus Mendes, it was shot in Paulínia and São Paulo.

Billie and the Real Belle Bare All: Billie and the Real Belle Bare All is a one-off television programme that aired on ITV2 on 25 January 2010, ahead of the Series 3 premiere of "Secret Diary of a Call Girl".  The programme, which took place at The May Fair, consisted of Billie Piper, who stars as Hannah Baxter in "Secret Diary of a Call Girl", interviewing Dr. Brooke Magnanti, a former call girl who, until November 2009 remained anonymous, known only by the pseudonym, "Belle de Jour."

Hannah Baxter: Hannah Baxter is the lead semi-fictional character and protagonist of the British ITV2 television series "Secret Diary of a Call Girl".  Hannah secretly has a double life as a high-class call girl as her alter ego Belle, for which she acknowledges and comments directly to the audience, throughout each episode.

Portrait of a Call Girl: Portrait of a Call Girl is a 2011 American pornographic film starring Jessie Andrews, and directed and written by Graham Travis.  In 2012, the film received 19 nominations for both creative and technical awards, winning four AVN Awards for best actress, best director, best feature and the AVN's first Movie of the Year award; one XRCO Award for best epic; and six XBIZ Awards for acting performance of the year – female, best cinematography, best non-sex acting performance of the year, director of the year – individual project, and feature movie of the year.

Belle de Jour (writer): Brooke Magnanti (born November 1975) is an American-born naturalised British research scientist, blogger, and writer, who, until her identity was revealed in November 2009, was known by the pen name Belle de Jour.  While completing her doctoral studies, between 2003 and 2004, Magnanti supplemented her income by working as a London call girl known by the working name Taro.

Supporting paragraphs: The Intimate Adventures of a London Call Girl Belle de Jour (writer)
Answer: 2009