Billie Piper will appear on The Graham Norton Show tomorrow night and reveals how she is often mistaken for prostitute Belle de Jour – her character in Secret Diary Of A Call Girl.

The 30-year-old actress,originally from West Swindon, told Graham: “When I moved to the country people thought I was a genuine prostitute.

"It happened in America too, where they introduce people with a biography, and I was introduced as the prostitute.”