Outside Doctor Who

ITV
Billie Piper has reportedly signed up for a fourth series of Secret Diary Of A Call Girl.

The Daily Star reports that the actress will be paid £2 million to reprise her role as Belle de Jour.

The fourth series will follow Belle as she continues to juggle her double life as an author and an escort.

Filming for the show will reportedly begin later this year and ITV2 is hoping to screen the series from January 27, 2011.

Piper has previously admitted that she does not know where the programme could go next.