OSLO, NORWAY - MAY 10:    Crown Princess Mette-Marit of Norway and Crown Prince Haakon of Norway leave to attend a lunch on the Norwegian Royal Yacht 'Norge' as part of the celebrations of the 80th Birthdays of King Harald of Norway and Queen Sonja of Norway on May 10, 2017 in Oslo, Norway.  (Photo by Julian Parker/UK Press via Getty Images)