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Billie Piper has revealed that real-life hookers helped her prepare for her latest TV role as prostitute Belle de Jour.
'It has been a real eye-opener filming this series,' says Billie, 24.
'I met a few call girls to learn about how to play Belle. I couldn't be prudish and shy not playing a woman who sells her body.
'I've learned one or two things to take home. I've always been intrigued about swingers' parties.'
And Billie will shock audiences when she says c**t in the drama which has obscene language and raunchy content.
We've had a look at a clip from the series and it's X-rated stuff. You have been warned!
See the trailer for The Secret Diary Of A Call Girl...
See an X-rated scene (adults only)...
The Secret Diary Of A Call Girl starts on ITV2 on 27 September.