Following a tradition whereby her mother, Queen Juliana (in 1980), and grandmother, Queen Wilhelmina (in 1948), abdicated the throne, seventy-five-year old Queen Beatrix of the Netherlands abdicated in favor of her eldest son and heir, Crown Prince Willem-Alexander, after a 33-year reign. The historic event took place when Queen Beatrix signed the Act of Abdication in front of the Dutch Cabinet on April 30, 2013 in the Moseszaal at Amsterdam’s Royal Palace. For the first time in over 100 years, the Netherlands has a reigning king. Princess Beatrix, as the former queen is now known, later introduced her son to thousands of his new subjects during a balcony appearance, by saying, ‘I am happy and grateful to introduce to you your new king, Willem-Alexander.” The new King Willem-Alexander (46) and his Argentine-born wife, Queen Maxima (41), were joined on the balcony of the Royal Palace by their daughters, Princess Catharina-Amalia (9), now first in line to the throne and Princess of Orange; Princess Alexia (7), and Princess Ariane (6). Many in the crowd wore orange in celebration of the Dutch royal house. Photos by Getty Images.