From the Daily Mail:
Six months after Matt Smith was unveiled as the new Time Lord, the actor finally began filming scenes for his Doctor Who debut this week.
The 26-year-old actor and the doctor's assistant Karen Gillan, 21, were spotted on location in Cardiff filming their first scenes together.
A sneak peek of the new show, which won't be broadcast on BBC until 2010, gives fans a chance to see the Doctor's new costume....