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AMSTERDAM, NETHERLANDS - JANUARY 27: King Willem-Alexander of The Netherlands, Princess Amalia of The Netherlands, Princess Irene of The Netherlands and Princess Margarita de Bourbon de Parme visit the Dressage World Cup at Jumping Amsterdam on January 27, 2019 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)

AMSTERDAM, NETHERLANDS - JANUARY 27: King Willem-Alexander of The Netherlands, Princess Amalia of The Netherlands, Princess Irene of The Netherlands and Princess Margarita de Bourbon de Parme visit the Dressage World Cup at Jumping Amsterdam on January 27, 2019 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)