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WATERLOO, BELGIUM - JUNE 29: King Albert II of Belgium and Queen Paola of Belgium attend a concert at the Music Chapel to celebrate Paola's 80th anniversary on June 29, 2017 in Waterloo, Belgium. (Photo by Olivier Matthys/Getty Images)

WATERLOO, BELGIUM - JUNE 29:  King Albert II of Belgium and Queen Paola of Belgium attend a concert at the Music Chapel to celebrate Paola's 80th anniversary on June 29, 2017 in Waterloo, Belgium.  (Photo by Olivier Matthys/Getty Images)