New Dr Who Matt Smith's claim to fame is that he bedded former Time Lord side-kick Billie Piper in Secret Diary of a Call Girl.

At 26, Matt is the youngest actor to take on the Tardis traveller - but before hitting the big time, Matt's most memorable role was ravaging Billie.

Matt appeared alongside the former pop star in her hit ITV show Diary of a Call Girl as one of prostitute Belle's clients.

Rumours were rife that Billie would fill David Tennant's shoes but young Matt clinched the spot.

Matt told the Mirror, “I’m so excited I haven’t slept.

"When I got the role was I paced round the room for about three days because I didn’t know what to do.

“It’s nerve-wracking, but a wonderful privilege and challenge and I’m honoured to have been given this opportunity.”

See Matt in bed with Billie below