BBC - Doctor Who - News - Donna says "I do!": "Catherine Tate is set to return to the TARDIS for the complete 13 week run of Series Four of Doctor Who.
Award winning comedian Tate will reprise her role as Donna, the runaway bride from last year's Christmas special, despite turning down the Doctor's invitation to travel with him at the end of that adventure."
I don't think I want to go near a Doctor Who message board for, oh, the next year or so...