Photo: Getty Images1/12King George VI, Princess Elizabeth, and Princess Margaret in a doorway holding books at the Royal Lodge in Windsor Castle, England, April 11, 1942.
Photo: Getty Images2/12Queen Elizabeth II and Prince Philip, Duke of Edinburgh, pose for a portrait at home in Buckingham Palace in London, December 1958.
Photo: Getty Images3/12Princess Elizabeth and Prince Philip make their way down the aisle of Westminster Abbey, London, on their wedding day, November 20, 1947.
Photo: Getty Images4/12Princess Elizabeth and the Duke of Edinburgh after their wedding ceremony, November 20, 1947.
Photo: Getty Images5/12Queen Elizabeth and Prince Philip in the Library of Balmoral Castle in Scotland, September 1977.
6/12Prince Charles and Princess Diana on their wedding day on the balcony of Buckingham Palace. From left: The Queen Mother; pageboys Lord Nicholas Windsor and Edward van Cutsem; bridesmaids Sarah Jane Gaselee, Catherine Cameron, and Clementine Hambro; Queen Elizabeth II.
Photo: Getty Images7/12Queen Elizabeth perches in a howdah on the back of an elephant at Benares during her tour of India, January 25, 1961.
Photo: Getty Images8/12Queen Elizabeth and Prince Philip on safari during their state visit to Zambia, 1979.
Photo: Getty Images9/12Queen Elizabeth and Prince Philip drive past Buckingham Palace in the state coach during her Silver Jubilee, 1977.
Photo: Getty Images10/12Queen Elizabeth is greeted by crowds in London during celebrations of her Silver Jubilee, June 7, 1977. She is accompanied by the Lord Mayor of London, Sir Robin Gillett (right).
Photo: Getty Images11/12Queen Elizabeth; Prince Philip; and their children, Prince Charles and Princess Anne, on the grounds of Balmoral, Scotland, September 1952. King Faisal II of Iraq, their guest at the time, is pictured here as well.
Photo: Getty Images12/12Their Royal Highnesses Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, kiss on the balcony at Buckingham Palace, April 29, 2011.