Princess Anne

Princess Anne was the Princess Royal of the British Royal Family in the 21st century. (PROSE: Doctor Who: The Encyclopedia) When the Tenth Doctor theorised that the Royal Family might be werewolves after Queen Victoria's encounter with a Lupine Wavelength Haemovariform in 1879, Rose Tyler initially doubted this, but then said, "Mind you, Princess Anne." (TV: Tooth and Claw)

Norton Folgate believed that Princess Anne had an equine face. (AUDIO: The Unbegotten)

Behind the scenes
Princess Anne is the daughter of Queen Elizabeth II and Prince Philip, the younger sister of King Charles III, and the aunt of William, Prince of Wales and Prince Harry.

She is the great great great granddaughter of Queen Victoria and Prince Albert. Though this would have seemingly made her or other royal descendants inheriting the werewolf cells impossible as Albert dies before 1879 in both the real world and the DWU, in Tooth and Claw the Tenth Doctor suggests that Victoria might have given her children (which would have included her son and Anne's great great grandfather King Edward VII) a "quick nip".

She was portrayed by Alexandra Moen in the telefilm Whatever Love Means and Elizabeth Berrington in Spencer.