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Princess Elizabeth (now Queen Elizabeth II) with two corgi dogs at her home at 145 Piccadilly, London, July 1936. (Photo by Lisa Sheridan/Studio Lisa/Hulton Archive/Getty Images)

Princess Elizabeth (now Queen Elizabeth II) with two corgi dogs at her home at 145 Piccadilly, London, July 1936. (Photo by Lisa Sheridan/Studio Lisa/Hulton Archive/Getty Images)

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Queen Elizabeth II leaves Schloss Augustusburg in Bruhl, Germany, after attending a State Reception, May 1965. She is wearing the Jubilee Necklace and a diamond bow brooch with pearl drop inherited from Queen Mary. (Photo by Fox Photos/Hulton Archive/Getty Images)

Queen Elizabeth II leaves Schloss Augustusburg in Bruhl, Germany, after attending a State Reception, May 1965. She is wearing the Jubilee Necklace and a diamond bow brooch with pearl drop inherited from Queen Mary.  (Photo by Fox Photos/Hulton Archive/Getty Images)

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LONDON - NOVEMBER 23: Britain's Queen Elizabeth II smiles as she looks out of the window of her horse drawn carriage as she leaves the Houses of Parliament after delivering her annual speech at the State Opening of Parliament on November 23, 2004 in London, England. (Photo by Scott Barbour/Getty Images)

LONDON - NOVEMBER 23:  Britain's Queen Elizabeth II smiles as she looks out of the window of her horse drawn carriage as she leaves the Houses of Parliament after delivering her annual speech at the State Opening of Parliament on November 23, 2004 in London, England. (Photo by Scott Barbour/Getty Images)

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WINDSOR, UNITED KINGDOM - APRIL 16: Queen Elizabeth II leaves the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Peter Nicholls/WPA Pool/Getty Images)

WINDSOR, UNITED KINGDOM - APRIL 16: Queen Elizabeth II leaves the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Peter Nicholls/WPA Pool/Getty Images)