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Dutch Princess Mabel, Chairman of Girls Not Brides Global, deliver a speech during the launch with Foundation Children stamps, Plan Netherlands and Save the Children of the organization Girls Not Brides Netherlands, an international network that fights against child marriages, in Amsterdam, on November 7, 2016 2016. / AFP / ANP / Evert Elzinga / Netherlands OUT (Photo credit should read EVERT ELZINGA/AFP/Getty Images)

Dutch Princess Mabel, Chairman of Girls Not Brides Global, deliver a speech during the launch with Foundation Children stamps, Plan Netherlands and Save the Children of the organization Girls Not Brides Netherlands, an international network that fights against child marriages, in Amsterdam, on November 7, 2016 2016.  / AFP / ANP / Evert Elzinga / Netherlands OUT        (Photo credit should read EVERT ELZINGA/AFP/Getty Images)

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DUBAI, DUBAI - NOVEMBER 08: Camilla, Duchess of Cornwall and Princess Haya Bint Al Hussein laugh as they sign a commercial agreement between Alder Hey and Al Jalila Children's Speciality Hospital on day 3 of a Royal tour of the United Arab Emirates at Al Jalila Children's Speciality Hospital on November 8, 2016 in Dubai, United Arab Emirates. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Chris Jackson - WPA Pool/Getty Images)

DUBAI, DUBAI - NOVEMBER 08:  Camilla, Duchess of Cornwall and Princess Haya Bint Al Hussein laugh as they sign a commercial agreement between Alder Hey and Al Jalila Children's Speciality Hospital on day 3 of a Royal tour of the United Arab Emirates at Al Jalila Children's Speciality Hospital on November 8, 2016 in Dubai, United Arab Emirates. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain.  (Photo by Chris Jackson - WPA Pool/Getty Images)