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OSLO, NORWAY - MAY 10: Prince Guillaume of Luxembourg and Princess Stephanie 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 Nigel Waldron/ Getty Images)

OSLO, NORWAY - MAY 10: Prince Guillaume of Luxembourg and Princess Stephanie 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 Nigel Waldron/ Getty Images)