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LONDON, UNITED KINGDOM - DECEMBER 8: (L-R) Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II, Prince Philip, Duke of Edinburgh, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for the annual evening reception for members of the Diplomatic Corps at Buckingham Palace on December 8, 2016 in London, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 8:  (L-R) Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Queen Elizabeth II, Prince Philip, Duke of Edinburgh, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for the annual evening reception for members of the Diplomatic Corps at Buckingham Palace on December 8, 2016 in London, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)

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Queen Elizabeth II with one of her corgis at Sandringham, 1970. (Photo by Fox Photos/Hulton Archive/Getty Images)

Queen Elizabeth II with one of her corgis at Sandringham, 1970. (Photo by Fox Photos/Hulton Archive/Getty Images)

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BERLIN, GERMANY - JUNE 24: Queen Elizabeth II arrives for the state banquet in her honour at Schloss Bellevue palace on the second of the royal couple's four-day visit to Germany on June 24, 2015 in Berlin, Germany. The Queen and Prince Philip are scheduled to visit Berlin, Frankfurt and the concentration camp memorial at Bergen-Belsen during their trip, which is their first to Germany since 2004. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 24:  Queen Elizabeth II arrives for the state banquet in her honour at Schloss Bellevue palace on the second of the royal couple's four-day visit to Germany on June 24, 2015 in Berlin, Germany. The Queen and Prince Philip are scheduled to visit Berlin, Frankfurt and the concentration camp memorial at Bergen-Belsen during their trip, which is their first to Germany since 2004.  (Photo by Sean Gallup/Getty Images)

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POUNDBURY, DORSET - OCTOBER 27: Queen Elizabeth II tours Queen Mother Square on October 27, 2016 in Poundbury, Dorset. (Photo by Samir Hussein/WireImage)

POUNDBURY, DORSET - OCTOBER 27:  Queen Elizabeth II tours Queen Mother Square on October 27, 2016 in Poundbury, Dorset.  (Photo by Samir Hussein/WireImage)

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LONDON, UNITED KINGDOM - NOVEMBER 13: Queen Elizabeth II Smiling As She Arrives At The Palace Of Westminster For The State Opening Of Parliament. The Queen Is Wearing A Diamond Crown Known As The State Diadem Made For The Coronation Of George Lv. She Is Wearing An Embroidered Cream Satin Dress Covered With A Fur-trimmed Robe. (Photo by Tim Graham Picture Library/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 13:  Queen Elizabeth II Smiling As She Arrives At The Palace Of Westminster For The State Opening Of Parliament.  The Queen Is Wearing A Diamond Crown Known As The State Diadem Made For The Coronation Of George Lv.  She Is Wearing An Embroidered Cream Satin Dress Covered With A Fur-trimmed Robe.  (Photo by Tim Graham Picture Library/Getty Images)