From the BBC:
Jane Tranter, BBC Controller of Drama Commissioning, confirmed last night that a third series of Doctor Who - plus a second Christmas special - has been commissioned.
Tranter also confirmed that Billie Piper, who plays the Doctor's companion Rose Tyler, would feature in every episode of series two including the Christmas special.
Filming of the Christmas special and second series with Casanova star David Tennant - who plays the tenth Doctor - is due to begin next month.
The current series concludes on BBC ONE on Saturday (18 June) at 7.00pm.