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)
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)