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A teenage Princess Caroline, photographed at her private school outside of Paris in 1974.

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Princess Caroline and her mother Grace Kelly in matching tweed, circa 1970s France.

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A Monegasque royal family outing (from left: Prince Albert, Grace Kelly, Princess Caroline, and Prince Rainier) at the 1976 Red Cross Ball in Monte Carlo.

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Après-ski chic according to Princess Caroline (pictured here with her brother Prince Albert in 1976).

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In 1978, the 21-year-old princess accompanied her mother to the Ocean City, the coastal New Jersey town where Grace Kelly spent her summers growing up.