Actress Billie Piper has announced she's cutting back on her workload. The former Doctor Who star made the decision so she can spend more time with her son. Piper gave birth to baby Winston in October. She'll reduce her acting work after filming the third series of Secret Diary Of A Call Girl next month. Billie revealed she is an executive producer on the new series of the ITV2s show, where she plays high-class prostitute Belle. She also revealed that one day she hopes to set up a production company with her hubby, actor Laurence Fox. The pair married in December 2007, with ex-husband Chris Evans attending the ceremony.