OSLO, NORWAY - MAY 10:     King Harald and Queen Sonja of Norway attend a Gala Banquet hosted by The Government at The Opera House as part of Celebrations of their 80th Birthdays. on May 10, 2017 in Oslo, Norway.  (Photo by Julian Parker/UK Press via Getty Images)
OSLO, NORWAY - MAY 10:  Prince Guillaume of Luxembourg and Princess Stephanie of Luxembourg arrives at the Opera House on the occasion of the celebration of King Harald and Queen Sonja of Norway 80th birthdays on May 10, 2017 in Oslo, Norway. (Photo by Nigel Waldron/ Getty Images)
OSLO, NORWAY - MAY 10: Princess Marie of Denmark, Prince Joachim of Denmark arrives at the Opera House on the occasion of the celebration of King Harald and Queen Sonja of Norway 80th birthdays on May 10 2017 in Oslo, Norway. (Photo by Nigel Waldron/ Getty Images)
OSLO, NORWAY - MAY 10: King Juan Carlos of Spain and Queen Sofia of Spain arrives at the Opera House on the occasion of the celebration of King Harald and Queen Sonja of Norway 80th birthdays on May 10 2017 in Oslo, Norway. (Photo by Nigel Waldron/ Getty Images)
OSLO, NORWAY - MAY 10: Queen Margrethe of Denmark and Queen Anne Marie, Greece  arrives at the Opera House on the occasion of the celebration of King Harald and Queen Sonja of Norway 80th birthdays on May 10 2017 in Oslo, Norway. (Photo by Nigel Waldron/ Getty Images)