The cast of British period drama Downton Abbey is set to get a taste of royalty - the granddaughter of Queen Elizabeth II's cousin, Princess Alexandra Of Kent, has reportedly landed a small role on the upcoming season of the hit Tv series. Eighteen-year-old Fiona Ogilvy, who is 45th in line to the throne, will appear as an extra in scenes alongside Dame Maggie Smith and Hugh Bonneville, according to the U.K.'s Daily Express newspaper.