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ZWOLLE, NETHERLANDS - APRIL 27: Prince Bernhard of The Netherlands and Princess Anita of the Netherlands attends King's Day (Koningsdag), the celebration of the birthday of the Dutch King, on April 27, 2016 in Zwolle, Netherlands. Parties and concerts are held across the Netherlands as members of the Dutch royal family oversee festivities. (Photo by Andreas Rentz/Getty Images)

ZWOLLE, NETHERLANDS - APRIL 27:  Prince Bernhard of The Netherlands and Princess Anita of the Netherlands attends King's Day (Koningsdag), the celebration of the birthday of the Dutch King, on April 27, 2016 in Zwolle, Netherlands. Parties and concerts are held across the Netherlands as members of the Dutch royal family oversee festivities.  (Photo by Andreas Rentz/Getty Images)