The woman whose secret life as a £300-an-hour call girl made her a fortune is suing her ex-boyfriend for libel - because he claims she was never a prostitute . Dr Brooke Magnanti , 39 , whose diary of her adventures working as a high class escort was published anonymously under the pen name 'Belle de Jour ' , is reportedly suing on the grounds that the claim damages her reputation . Her blog told of her life as a struggling graduate in London and working as call girl to fund her studies - and included her former lover Owen Morris , known only as 'The Boy ' . It led to two bestselling books and the successful Secret Diary Of A Call Girl series , starring Billie Piper . Scroll down for video . Dr Brooke Magnanti ( right ) is suing her ex-boyfriend for claiming she never was a prostitute . The 39-year-old 's blog spawned two bestselling books and an ITV series starring Billie Piper ( left ) But American-born Dr Magnanti has said she faced a backlash for glamourising prostitution after her identity was revealed . The books and series also led Mr Morris , a former RAF officer , to file a lawsuit in 2013 challenging Dr Magnanti 's version of events . He claimed her stories were based on her sex life with him . But in what is likely a legal first , Dr Magnanti 's legal team had launched a counter-claim at Edinburgh 's Court of Sessions , VICE reported . They are set to argue that claiming she had never worked as a prostitute is defamatory . Mr Morris , who is known only as ‘ The Boy ’ in the books , pursued damages for defamation and breach of privacy against Dr Magnanti after the release of her books , who has a PhD in Forensic Science . Dr Brooke Magnanti 's ( pictured left , with Billie Piper ) has filed a counter-claim to ex-lover Owen Morris 's suit claiming her books were based on 'fantasy ' Soon after their relationship ended in 2008 , he claimed her books - The Intimate Adventures Of A London Call Girl , in 2005 , and The Further Adventures Of A London Call Girl , in 2006 - were 'fantasy ' . Writing on blog Sexonomics at the time , she said : ' I have no choice but to defend this . But am happy to do so even though it will almost certainly mean losing everything I have even when I win . ' She took to her blog to vehemently deny his allegations , insists her blog and the resulting books are true . A statement from Dr Magnanti 's legal team to Vice said : ' I can confirm a counter-claim has been lodged . ' I have been advised by my QC to offer no further comment pending the resolution of this litigation . '
Dr Brooke Magnanti 's past life working as an escort made her a fortune . Her blog led to two bestselling books and a TV series starring Billie Piper . But former lover Owen Morris claimed her books were based on 'fantasy ' He filed a lawsuit for defamation and breach of privacy against her in 2013 . Now , the 39-year-old 's legal team has filed a counter-claim arguing his claims damage her reputation .