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MONACO - APRIL 12: On April 12Th 1950, In Monaco, From Left To Right, Princess Antoinette, Rainier'S Sister, His Mother Princess Charlotte, Prince Rainier And Prince Pierre De Polignac, Rainier'S Father, At The Cathedral For The Religious Service Before Ascending To The Throne. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

MONACO - APRIL 12:  On April 12Th 1950, In Monaco, From Left To Right, Princess Antoinette, Rainier'S Sister, His Mother Princess Charlotte, Prince Rainier And Prince Pierre De Polignac, Rainier'S Father, At The Cathedral For The Religious Service Before Ascending To The Throne.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)