Princess Mabel (left) and Princess Beatrix (right) of the Netherlands attend the Royal Netherlands Society of Engineers (KIVI) 2016 Prince Friso Engineering Award ceremony in Delft on March 16, 2016. The award is named for Dutch prince Johan Friso, who was the son of Princess Beatrix and husband of Princess Mabel. The prince was seriously injured in a skiing accident in 2012 and died in 2013.
Dutch royals attend New Year's reception for diplomats
King Willem-Alexander and Queen Máxima of the Netherlands attend a New Year's reception for the diplomatic corps at the Royal Palace of Amsterdam on January 13, 2015.
Celebrations in the Netherlands
Princess Beatrix visits Dutch Church in London
Princess Beatrix of the Netherlands attends celebrations at the Dutch Church in London, England on April 24, 2015 to mark the 140th anniversary of the Koning Willem Fonds (King William Fund). (Photo by Max Mumby/Indigo/Getty Images)
Beatrix joins Willem-Alexander, Maxima, & their daughters on ski vacation
Princess Beatrix attends funeral of former German president
Princess (formerly Queen) Beatrix of the Netherlands attends the funeral of Germany's former president Richard von Weizsäcker in Berlin on February 11, 2015. (Photos by Georg Hilgemann – Pool/Getty Images)
Dutch royals at reception for foreign diplomats
King Willem-Alexander and Queen Maxima of the Netherlands arrive at the Royal Palace of Amsterdam on January 14, 2015 for their traditional New Year's reception for foreign diplomats (Photos by Koen van Weel/AFP/Getty Images)
Funeral of Belgium's Fabiola
Princess Beatrix visits Norwegian Church's Christmas market
Princess Beatrix of the Netherlands arrives at the Norwegian Church in Rotterdam on November 13, 2014 to attend the yearly Christmas market. (Photo by BAS CZERWINSKI/AFP/Getty Images)
Dutch royals attend MH17 memorial
King Willem-Alexander of the Netherlands; his wife, Queen Máxima; and his mother, Princess Beatrix, arrive at RAI Convention Center in Amsterdam on November 10, 2014 to attend a national commemoration for the victims of the Malaysia Airlines flight MH17 disaster, which took the lives of 193 Dutch citizens. (Photo by Yasin Yagci/Anadolu Agency/Getty Images)