AMSTERDAM, NETHERLANDS - MAY 5: King Willem-Alexander and Queen Maxima of The Netherlands attend the annual Liberation Day concert on the Amstel on May 05, 2017 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)
AMSTERDAM, NETHERLANDS - MAY 5: King Willem-Alexander and Queen Maxima of The Netherlands attend the annual Liberation Day concert on the Amstel on May 05, 2017 in Amsterdam, Netherlands. (Photo by Patrick van Katwijk/Getty Images)