Via Hello! Magazine: David Tennant, who played the tenth Doctor Who,
"... is reportedly engaged to Georgia Moffett – the actress daughter of fifth Time Lord Peter Davison."
"David and 26-year-old Georgia are apparently planning to wed on New Year's Day 2012.
"The couple have been dating for two-and-a-half years, after meeting on the set of Doctor Who in 2008.
"Georgia appeared in an episode, playing the Doctor's daughter Jenny (pictured above)."
Peter Davison and David Tennant.
As Slashdot puts it:
"In a veritable Who's Who of Doctor Who, 10th Doctor David Tennant is marrying Georgia Moffett, the daughter of 5th Doctor Peter Davison, who played the Doctor's daughter in an episode of Doctor Who. Except that the Doctor's daughter was a clone of the Doctor, which meant that she really was Who. So a newer Doctor is marrying an older Doctor's daughter, who is a clone of the newer doctor, but only has half the DNA of the older Doctor."
Hat tip to Adrian Sinnott! Thanks, Adrian!