OSLO, NORWAY - MAY 09: Prince Constantijn and Princess Mabel of The Netherlands attend the official Gala dinner at the Royal Palace on May 9, 2017 in Oslo, Norway. King Harald and Queen Sonja of Norway are celebrating their 80th birthdays. (Photo by Patrick van Katwijk/Getty Images)
OSLO, NORWAY - MAY 09: King Willem-Alexander, Queen Maxima, Princess Beatrix and Princess Mabel of The Netherlands attend the official Gala dinner at the Royal Palace on May 9, 2017 in Oslo, Norway. King Harald and Queen Sonja of Norway are celebrating their 80th birthdays. (Photo by Patrick van Katwijk/Getty Images)
OSLO, NORWAY - MAY 09: Sophie, Countess of Wessex, Hereditary grand Duke Guillaume, Hereditary Grand Duchess Stephanie of Luxembourg and Princess Mabel of The Netherlands attend the official Gala dinner at the Royal Palace on May 9, 2017 in Oslo, Norway. King Harald and Queen Sonja of Norway are celebrating their 80th birthdays. (Photo by Patrick van Katwijk/Getty Images)
OSLO, NORWAY - MAY 09: King Philippe and Queen Mathilde of Belgium attend the official Gala dinner at the Royal Palace on May 9, 2017 in Oslo, Norway. King Harald and Queen Sonja of Norway are celebrating their 80th birthdays. (Photo by Patrick van Katwijk/Getty Images)
OSLO, NORWAY - MAY 09: Crown Prince Frederik and Crown Princess Mary of Denmark attend the official Gala dinner at the Royal Palace on May 9, 2017 in Oslo, Norway. King Harald and Queen Sonja of Norway are celebrating their 80th birthdays. (Photo by Patrick van Katwijk/Getty Images)
