Question: What former call girl and madam had her memoir adapted to a film directed by Nicholas Sgarro?

Context articles: The Intimate Adventures of a London Call Girl
A House Is Not a Home (film)
Annie Lobert
Ashley Alexandra Dupré
Xaviera Hollander
Confessions of a Brazilian Call Girl
The Happy Hooker (film)
Billie and the Real Belle Bare All
Vanessa de Oliveira
Lies Before Kisses

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".
A House Is Not a Home is a 1964 drama film loosely based on the 1953 autobiography by madam Polly Adler.
 The film stars Shelley Winters, Robert Taylor, Cesar Romero, and Kaye Ballard.
 Raquel Welch made her film debut in a small role as a call girl.
 The song written for the film by Burt Bacharach & Hal David has become a standard.
Annie Lobert (born September 26, 1967) is an American former call girl and sex industry worker, who founded the international Christian ministry Hookers for Jesus.
 In 2010, she produced and starred in a three-part documentary on the organization, titled "Hookers: Saved on the Strip", which was broadcast nationwide on cable television's Investigation Discovery.
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.
Xaviera Hollander (born 15 June 1943) is a former call girl, madam, and author.
 She came to be best known for her best-selling memoir "The Happy Hooker: My Own Story."
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.
The Happy Hooker is a 1975 biographical-comedy film directed by Nicholas Sgarro and starring Lynn Redgrave.
 It was adapted from a best-selling book based on the life of Xaviera Hollander.
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."
Vanessa de Oliveira (born 12 March 1975) is a Brazilian writer and former call girl.
Lies Before Kisses is a 1991 American made-for-television thriller film directed by Lou Antonio.
 The film, starring Jaclyn Smith and Ben Gazzara, focuses on the trial against a successful businessman, who has allegedly murdered a call girl as a consequence for a blackmailing incident.