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Prince Rainier III of Monaco joins his fiancee US actress Grace Kelly, holding her dog Oliver, aboard the princely yacht 'Deo Juvante II' on April 12, 1956 in Monte Carlo's harbour, while Grace Kelly arrives from USA for their wedding ceremony, planned on April 19, 1956. (Photo credit should read -/AFP/Getty Images)

Prince Rainier III of Monaco joins his fiancee US actress Grace Kelly, holding her dog Oliver, aboard the princely yacht 'Deo Juvante II' on April 12, 1956 in Monte Carlo's harbour, while Grace Kelly arrives from USA for their wedding ceremony, planned on April 19, 1956. (Photo credit should read -/AFP/Getty Images)