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US actress Grace Kelly (R) and Prince Rainier III of Monaco (L) arrive in Monaco Bay aboard the princely yacht 'Deo Juvante II' , on April 12, 1956 after Grace Kelly crossed the Atlantic Ocean for her wedding ceremony with the Prince, planned on April 12, 1956. (Photo credit should read -/AFP/Getty Images)

US actress Grace Kelly (R) and Prince Rainier III of Monaco (L) arrive in Monaco Bay aboard the princely yacht 'Deo Juvante II' , on April 12, 1956 after Grace Kelly crossed the Atlantic Ocean for her wedding ceremony with the Prince, planned on April 12, 1956. (Photo credit should read -/AFP/Getty Images)