Catherine Tate is new 'Doctor Who' companion

Catherine Tate has been confirmed as David Tennant's new companion in the next series of Doctor Who.

The comedian will reprise her role as Donna, who featured in the most recent Christmas special, 'The Runaway Bride', for the full thirteen-episode run of series four. As previously reported, Freema Agyeman will return to the show mid-way through the series, which begins filming this month for broadcast from next Easter.

"Catherine was an absolute star in The Runaway Bride and we are delighted that one of Britain's greatest talents has agreed to join us for the fourth series," said exec producer Russell T Davies. "Viewers can expect more ambitious storylines and a whole host of guest stars in 2008."

Tate added: "I am delighted to be returning to Doctor Who. I had a blast last Christmas and look forward to travelling again through time and space with that nice man from Gallifrey."

The news follows confirmation that Kylie Minogue will guest star in this year's Christmas special, 'Voyage of the Damned'.