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OSLO, NORWAY - MAY 10: Guillaume, Hereditary Grand Duke of Luxembourg and Stephanie, Hereditary Grand Duchess of Luxembourg attend a lunch on the Norwegian Royal yatch 'Norge'to celebrate the 80th birthdays of King Harald of Norway and Queen Sonja of Norway on May 10, 2017 in Oslo, Norway. (Photo by Patrick van Katwijk/Getty Images)

OSLO, NORWAY - MAY 10: Guillaume, Hereditary Grand Duke of Luxembourg and Stephanie, Hereditary Grand Duchess of Luxembourg attend a lunch on the Norwegian Royal yatch 'Norge'to celebrate the 80th birthdays of King Harald of Norway and Queen Sonja of Norway on May 10, 2017 in Oslo, Norway. (Photo by Patrick van Katwijk/Getty Images)