ZWOLLE, NETHERLANDS - APRIL 27: King Willem-Alexander of The Netherlands, Princess Ariane of The Netherlands and Princess Alexia of The Netherlands dance with spectators during 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)
