OK SPOILER! DON'T READ UNLESS YOU WANT TO KNOW:
Filming on David Tennant's finale as the Time Lord continues today on the streets of Cardiff with the return of Catherine Tate.
The award-winning actress played Donna Noble in the 2006 Christmas special, The Runaway Bride, and then returned (for the first time) in 2008's Partners In Crime and remained in the TARDIS throughout Series 4. Also spotted on set was Tate's onscreen grandfather, Bernard Cribbins, and mother, Jacqueline King.
Read it all at den of geek