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On the balcony of the Palace, Princess Grace, Prince Rainier of Monaco and their three children, Prince Albert, Princess Caroline and Princess Stephanie. (Photo by Rene Maestri/Sygma/Sygma via Getty Images)

On the balcony of the Palace, Princess Grace, Prince Rainier of Monaco and their three children, Prince Albert, Princess Caroline and Princess Stephanie. (Photo by Rene Maestri/Sygma/Sygma via Getty Images)