'Doctor Who' star David Tennant expecting third child with Georgia Moffett

The Doctor is getting a new companion! "Doctor Who" star David Tennant and his wife, Georgia Moffett, are expecting a baby. Tennant and Moffett married in December of 2011 and already have one daughter together, Olivia (born April 2011). Tennant also adopted Moffet's 10-year-old son from a previous relationship, Tyler, in March 2012.

"It's lovely, very lovely. It's exciting," Tennant told Jonathan Ross on Monday. You can watch his appearance below, but be warned -- it's not entirely safe for work.

Tennant will next appear in the UK on "Spies of Warsaw" on BBC Four, as a covert agent. It premieres Wednesday, January 9.