see more

Hundreds of people pose for a picture with Queen Maxima and King Willem-Alexander (C) after a dinner with 150 fifty-year-old Dutch people who were invited on the occasion of the 50th birthday of the king at the Royal Palace in Amsterdam, on April 28, 2017. / AFP PHOTO / ANP / Remko DE WAAL / Netherlands OUT (Photo credit should read REMKO DE WAAL/AFP/Getty Images)

Hundreds of people pose for a picture with Queen Maxima and King Willem-Alexander (C) after a dinner with 150 fifty-year-old Dutch people who were invited on the occasion of the 50th birthday of the king at the Royal Palace in Amsterdam, on April 28, 2017. / AFP PHOTO / ANP / Remko DE WAAL / Netherlands OUT        (Photo credit should read REMKO DE WAAL/AFP/Getty Images)

see more

AMSTERDAM, NETHERLANDS - APRIL 28: King Willem-Alexander and Queen Maxima of The Netherlands pose for a group picture with their guests after the dinner for 150 Dutch people to celebrate the king's 50th birthday in the Royal Palace on April 28, 2017 in Amsterdam, Netherlands. After the dinner the King and the Queen will open the Royal Palace for 50 hours with an exhibition that gives an overview of the Netherlands in the last 50 years. (Photo by Remko de Waal/POOL/Getty Images)

AMSTERDAM, NETHERLANDS - APRIL 28: King Willem-Alexander and Queen Maxima of The Netherlands pose for a group picture with their guests after the dinner for 150 Dutch people to celebrate the king's 50th birthday in the Royal Palace on April 28, 2017 in Amsterdam, Netherlands.  After the dinner the King and the Queen will open the Royal Palace for 50 hours with an exhibition that gives an overview of the Netherlands in the last 50 years.  (Photo by Remko de Waal/POOL/Getty Images)