Dutch King Willem-Alexander, Queen Máxima, and their daughters, Amalia, Alexia and Ariane, arrived in Emmen on Saturday morning. There they were received by Mayor Eric van Oosterhout and Jetta Klijnsma, the King's Commissioner for the Province of Drenthe.The family is celebrating King Willem-Alexander's 57th birthday in the city. The date chosen to celebrate the reigning monarch's birthday is a widely-celebrated national holiday in the Netherlands.