King Willem-Alexander (left) and Queen Maxima of the Netherlands (second from left) and their daughters Amalia, Ariane and Alexia (right to left) and Princess Beatrix, (second from right) and Princess Margriet (right) pose for photographers on the first King’s Day in Amstelveen yesterday. The Dutch are celebrating their first ever King’s Day, a national holiday held in honour of the Netherlands’ newly installed monarch, King Willem-Alexander.