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Britain's Queen Elizabeth II (3L) stands with her husband Britain's Prince Philip, Duke of Edinburgh (3R), her son Britain's Prince Charles, Prince of Wales (2L) and his wife Britain's Camilla, Duchess of Cornwall (L), and her grandson Britain's Prince William, Duke of Cambridge (2R) and his wife Britain's Catherine, Duchess of Cambridge, as they pose photo a photograph ahead of the annual evening reception for members of the Diplomatic Corps at Buckingham Palace, London on December 8, 2016. / AFP / POOL / Dominic Lipinski (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

Britain's Queen Elizabeth II (3L) stands with her husband Britain's Prince Philip, Duke of Edinburgh (3R), her son Britain's Prince Charles, Prince of Wales (2L) and his wife Britain's Camilla, Duchess of Cornwall (L), and her grandson Britain's Prince William, Duke of Cambridge (2R) and his wife Britain's Catherine, Duchess of Cambridge, as they pose photo a photograph ahead of the annual evening reception for members of the Diplomatic Corps at Buckingham Palace, London on December 8, 2016. / AFP / POOL / Dominic Lipinski (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
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AFP DOMINIC LIPINSKI

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LONDON, UNITED KINGDOM - DECEMBER 08: Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall depart after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England (Photo by Julian Parker/UK Press via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 08: Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall depart after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

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LONDON, UNITED KINGDOM - DECEMBER 08: Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall depart after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England (Photo by Julian Parker/UK Press via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 08: Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall depart after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

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LONDON, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge departs after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge departs after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
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Getty Images Entertainment Max Mumby/Indigo

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LONDON, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge departs after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge departs after attending the annual Diplomatic Reception at Buckingham Palace on December 8, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
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Getty Images Entertainment Max Mumby/Indigo