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PORTUGAL - FEBRUARY 11: Princess Maria Pia Of Savoy And Prince Alexander Of Yugoslavia In Cascais, Portugal, On February 11, 1955, The Day Before Their Wedding.She Is The Eldest Daughter Of King Humbert Ii Of Italy, And He Is The Son Of Regent Prince Paul Of Yugoslavia. They Divorced In 1967. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

PORTUGAL - FEBRUARY 11:  Princess Maria Pia Of Savoy And Prince Alexander Of Yugoslavia In Cascais, Portugal, On February 11, 1955, The Day Before Their Wedding.She Is The Eldest Daughter Of King Humbert Ii Of Italy, And He Is The Son Of Regent Prince Paul Of Yugoslavia. They Divorced In 1967.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)