Grace Kelly_2

Loomis Dean—Time & Life Pictures/Getty Images

At the time, Kelly seemed destined to have a long career as a movie star. But in April 1955, she met Monaco’s Prince Rainier at the Cannes Film Festival, and her life took a different path. Accepting his proposal of marriage, she became princess of the principality in 1956, retiring from Hollywood at just 26 years old.

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