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IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

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IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands laughs as she volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands laughs as she volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

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IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

IJSSELSTEIN, NETHERLANDS - MARCH 11: Princess Beatrix of The Netherlands volunteers for NL Doet in the the kindergarden on March 11, 207 in IJsstelsteijn, The Netherlands. NL Doet is a National Volunteer day organized by the Oranje Fonds. (Photo by Patrick Van Katwijk/Getty Images)

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Dutch Princess Beatrix helps to clean a monastery park in IJsselstein on March 11, 2017. Members of the Dutch royal family took part in the national voluntary event NLDoet. / AFP PHOTO / ANP / JEROEN JUMELET / Netherlands OUT (Photo credit should read JEROEN JUMELET/AFP/Getty Images)

Dutch Princess Beatrix helps to clean a monastery park in IJsselstein on March 11, 2017. 
Members of the Dutch royal family took part in the national voluntary event NLDoet.  / AFP PHOTO / ANP / JEROEN JUMELET / Netherlands OUT        (Photo credit should read JEROEN JUMELET/AFP/Getty Images)

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Dutch Princess Beatrix helps to clean a monastery park in IJsselstein on March 11, 2017. Members of the Dutch royal family took part in the national voluntary event NLDoet. / AFP PHOTO / ANP / JEROEN JUMELET / Netherlands OUT (Photo credit should read JEROEN JUMELET/AFP/Getty Images)

Dutch Princess Beatrix helps to clean a monastery park in IJsselstein on March 11, 2017. 
Members of the Dutch royal family took part in the national voluntary event NLDoet.  / AFP PHOTO / ANP / JEROEN JUMELET / Netherlands OUT        (Photo credit should read JEROEN JUMELET/AFP/Getty Images)