Billie for Doctor Who special?

Matt Smith has sparked rumours that Billie Piper could return for Doctor Who's 50th anniversary celebration show.

The star, who plays the Time Lord, was quoted as saying that she would be his favourite companion from the past to return for next year's one-off 90-minute anniversary special.

Matt, 29, said in The Sun: "If I wanted a companion from the past I would say Rose because I am good friends with Billie."

Billie played the companion of previous Doctors Christopher Eccleston and David Tennant until she left the BBC One sci-fi drama in 2010.

Last year, she was quoted as saying: "It's totally the end of Doctor Who for me, too. I can't imagine anything would bring me back, and they're done with Rose... They've got this great new set up with Matt Smith and Karen Gillan and it works brilliantly. So there's no way in the world it will happen again for me - well not for the foreseeable future."

The special, An Adventure In Space And Time, will tell the story of the genesis of Doctor Who - first broadcast on November 23, 1963.