3rd May 1951: Members of the British Monarchy assembled on the steps of St Paul's Cathedral, London, during the opening ceremony of the Festival of Britain (left to right) The Countess of Harewood, Countess Mountbatten, Earl Mountbatten, The Duchess of Kent, Princess Alexandra of Kent, The Princess Royal, The Duchess of Gloucester, Princess Margaret (1930 - 2002), The Duke of Edinburgh, Princess Elizabeth, Queen Mary and Queen Elizabeth. In the front are Michael of Kent and William of Gloucester. (Photo by Monty Fresco/Topical Press Agency/Getty Images)
Getty Images

Hulton Royals Collection Monty Fresco