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OSLO, NORWAY - MAY 10: King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands walk ahead of Princess Mabel of Orange-Nassau 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: King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands walk ahead of Princess Mabel of Orange-Nassau 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)