King Willem-Alexander and Queen Maxima of the Netherlands attend the Koningsdagconcert (King's Day Concert) at the Theaters Tilburg in Tilburg, The Netherlands, on April 3, 2017. The concert is played in honor of King Willem-Alexander, whose birthday is celebrated on Koningsdag or King's Day on April 27 - a national holiday. / AFP PHOTO / ANP / Merlin DALEMAN / Netherlands OUT (Photo credit should read MERLIN DALEMAN/AFP via Getty Images)
King Willem-Alexander and Queen Maxima of the Netherlands arive to attend the Koningsdagconcert (King's Day Concert) at the Theaters Tilburg in Tilburg, The Netherlands, on April 3, 2017. The concert is played in honor of King Willem-Alexander, whose birthday is celebrated on Koningsdag or King's Day on April 27 - a national holiday. / AFP PHOTO / ANP / Merlin Daleman / Netherlands OUT (Photo credit should read MERLIN DALEMAN/AFP via Getty Images)
King Willem-Alexander and Queen Maxima of the Netherlands shake hands as they arrive for the Koningsdagconcert (King's Day Concert) at the Theaters Tilburg in Tilburg, The Netherlands, on April 3, 2017. The concert is played in honour of King Willem-Alexander, whose birthday is celebrated on Koningsdag or King's Day on April 27 - a national holiday. / AFP PHOTO / ANP / Merlin Daleman / Netherlands OUT (Photo credit should read MERLIN DALEMAN/AFP via Getty Images)
TILBURG, NETHERLANDS - APRIL 4 : Princess Beatrix and her son Prince Constantijn of the Netherlands arrive at Theater Tilburg for the Kingsday concert on April 4, 2017 in Tilburg, The Netherlands. (Photo by Patrick van Katwijk/Getty Images)
King Willem-Alexander and Queen Maxima of the Netherlands as well as Princess Beatrix and Prince Constantijn attend the Koningsdagconcert (King's Day Concert) at the Theaters Tilburg in Tilburg, The Netherlands, on April 3, 2017. The concert is played in honor of King Willem-Alexander, whose birthday is celebrated on Koningsdag or King's Day on April 27 - a national holiday. / AFP PHOTO / ANP / Merlin Daleman / Netherlands OUT (Photo credit should read MERLIN DALEMAN/AFP/Getty Images)
