ROME, ITALY - APRIL 29: Princess Irene and Prince Carlos Hugo, duke of Parma posing before the wedding ceremony, on April 29, 1964 in Rome, Italy. (Photo by Keystone-France/Gamma-Keystine via Getty Images)
ROME, ITALY - APRIL 29: Princess Irene and Prince Carlos Hugo, duke of Parma posing before the wedding ceremony, on April 29, 1964 in Rome, Italy. (Photo by Keystone-France/Gamma-Keystine via Getty Images)