AMSTERDAM, NETHERLANDS - MAY 05: King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands attend the liberation day concert on the Amstel on May 05, 2018 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)
AMSTERDAM, NETHERLANDS - MAY 05: King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands attend the liberation day concert on the Amstel on May 05, 2018 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)