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BELGIUM - DECEMBER 15: King BAUDOUIN 1st in his lieutenant general army uniform and DONA FABIOLA de MORA y ARAGON, wearing a wedding dress made by Cristobal BALENCIAGA, posing at the Royal Palace of Brussels before their civil wedding, on December 15, 1960. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

BELGIUM - DECEMBER 15:  King BAUDOUIN 1st in his lieutenant general army uniform and DONA FABIOLA de MORA y ARAGON, wearing a wedding dress made by Cristobal BALENCIAGA, posing at the Royal Palace of Brussels before their civil wedding, on December 15, 1960.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)