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Dutch Queen Maxima (2L) arrives at the Carre Theatre in Amsterdam, on December 9, 2016, to attend the television recordings of The Christmas gala of the BZT Show. The gala is co-organized by the Foundation for More Music in the Classroom, of which the Queen is Honorary President. / AFP / ANP / JEROEN JUMELET / Netherlands OUT (Photo credit should read JEROEN JUMELET/AFP/Getty Images)

Dutch Queen Maxima (2L) arrives at the Carre Theatre in Amsterdam, on December 9, 2016, to attend the television recordings of The Christmas gala of the BZT Show.
The gala is co-organized by the Foundation for More Music in the Classroom, of which the Queen is Honorary President. / AFP / ANP / JEROEN JUMELET / Netherlands OUT        (Photo credit should read JEROEN JUMELET/AFP/Getty Images)

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Nobel Peace Prize laureate Colombian President Juan Manuel Santos (C) is received at Norway's Royal Palace in Oslo on December 10, 2016, prior to the award ceremony, by (from L) Norway's Crown Princess Mette-Marit, Crown Prince Haakon, King Harald of Norway and Queen Sonja of Norway. President Juan Manuel Santos receives this year's Nobel Peace Prize for his efforts to bring Colombia's more than 50-year-long civil war to an end. / AFP / NTB Scanpix / Terje BENDIKSBY / Norway OUT (Photo credit should read TERJE BENDIKSBY/AFP via Getty Images)

Nobel Peace Prize laureate Colombian President Juan Manuel Santos (C) is received at Norway's Royal Palace in Oslo on December 10, 2016, prior to the award ceremony, by (from L) Norway's Crown Princess Mette-Marit, Crown Prince Haakon, King Harald of Norway and Queen Sonja of Norway.
President Juan Manuel Santos receives this year's Nobel Peace Prize for his efforts to bring Colombia's more than 50-year-long civil war to an end. / AFP / NTB Scanpix / Terje BENDIKSBY / Norway OUT        (Photo credit should read TERJE BENDIKSBY/AFP via Getty Images)

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MUNICH, GERMANY - DECEMBER 08: Princess Ursula, Uschi zu Hohenlohe with a dog during the 'Artists for kids' charity auction at Galerie Thomas Modern on December 8, 2016 in Munich, Germany. (Photo by Gisela Schober/Getty Images)

MUNICH, GERMANY - DECEMBER 08: Princess Ursula, Uschi zu Hohenlohe with a dog during the 'Artists for kids' charity auction at Galerie Thomas Modern on December 8, 2016 in Munich, Germany. (Photo by Gisela Schober/Getty Images)

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UNSPECIFIED - DECEMBER 10: In this handout provided by Clarence House on December 10, 2016, shows The Prince of Wales and Duchess of Cornwall's 2016 Christmas card on a Christmas tree in Clarence House, London. The picture on the card was taken by Chris Jackson of Getty Images, showing the royal couple during their tour of Croatia where they met local performers wearing traditional dress in Tvrda, the old town of the city of Osijek. (Photo by Getty Images via Clarence House) This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.')

UNSPECIFIED - DECEMBER 10: In this handout provided by Clarence House on December 10, 2016, shows The Prince of Wales and Duchess of Cornwall's 2016 Christmas card on a Christmas tree in Clarence House, London. The picture on the card was taken by Chris Jackson of Getty Images, showing the royal couple during their tour of Croatia where they met local performers wearing traditional dress in Tvrda, the old town of the city of Osijek. (Photo by Getty Images via Clarence House)

This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.')

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UNSPECIFIED - DECEMBER 10: In this handout provided by Clarence House on December 10, 2016, shows The Prince of Wales and Duchess of Cornwall's 2016 Christmas card on a Christmas tree in Clarence House, London. The picture on the card was taken by Chris Jackson of Getty Images, showing the royal couple during their tour of Croatia where they met local performers wearing traditional dress in Tvrda, the old town of the city of Osijek. (Photo by Getty Images via Clarence House) This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.')

UNSPECIFIED - DECEMBER 10: In this handout provided by Clarence House on December 10, 2016, shows The Prince of Wales and Duchess of Cornwall's 2016 Christmas card on a Christmas tree in Clarence House, London. The picture on the card was taken by Chris Jackson of Getty Images, showing the royal couple during their tour of Croatia where they met local performers wearing traditional dress in Tvrda, the old town of the city of Osijek. (Photo by Getty Images via Clarence House)

This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.')