LONDON, ENGLAND - NOVEMBER 18: Sophie, Countess of Wessex (R) meets past and present Doctor Who actors (L-R) Matt Smith, Tom Baker, Peter Davison and John Hurt during a reception to mark the 50th anniversary of the hit TV series at Buckingham Palace as british actor Peter Davison, the fifth incarnation of the Doctor role looks on, onNovember 18, 2013 in London, England. Sophie, Countess of Wessex hosted a reception to mark the 50th anniversary of the TV series in which there have been 11 Doctors to date. It now holds the Guinness World Record for the longest running science fiction series in the world. (Photo by Eddie Mulholland - WPA Pool/Getty Images)
