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OSLO, NORWAY - MAY 17: Crown Prince Haakon, Crown Princess Mette- Marit, Princess Ingrid Alexandra and Prince Sverre Magnus attend the celebration of the Norwegian National Day at the Norwegian Royal Residence Skaugum on May 17, 2016 in Oslo, Norway. (Photo by Rune Hellestad - Corbis/Corbis via Getty Images)

OSLO, NORWAY - MAY 17: Crown Prince Haakon, Crown Princess Mette- Marit, Princess Ingrid Alexandra and Prince Sverre Magnus attend the celebration of the Norwegian National Day at the Norwegian Royal Residence Skaugum on May 17, 2016 in Oslo, Norway. (Photo by Rune Hellestad - Corbis/Corbis via Getty Images)