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Princess Eleonore (front L), Crown Princess Elisabeth (back L), Prince Emmanuel (front C), and Prince Gabriel (R) pose during a photo-shoot of the Belgian Royal Family's vacation at the MIM, Musical Instruments Museum, in Brussels, on July 19, 2016. / AFP / Belga / LAURIE DIEFFEMBACQ / Belgium OUT (Photo credit should read LAURIE DIEFFEMBACQ/AFP/Getty Images)

Princess Eleonore (front L), Crown Princess Elisabeth (back L), Prince Emmanuel (front C), and Prince Gabriel (R) pose during a photo-shoot of the Belgian Royal Family's vacation at the MIM, Musical Instruments Museum, in Brussels, on July 19, 2016. / AFP / Belga / LAURIE DIEFFEMBACQ / Belgium OUT        (Photo credit should read LAURIE DIEFFEMBACQ/AFP/Getty Images)