King Willem Alexander (C), Queen Maxima (2-R) and their daughters Amalia (3-R) and Alexia (L) acknowledge the crowd as the king celebrates his 50th birthday in Tilburg on April 27, 2017. The king's 50th birthday happens to fall on King's Day or Koningsdag formally known as Queen' Day until King Willem-Alexander ascended to the throne in 2013 following the reign of his mother. / AFP PHOTO / ANP / Remko de Waal / Netherlands OUT (Photo credit should read REMKO DE WAAL/AFP/Getty Images)
