Grace Kelly was caught cheating with another royal playboy before marrying Prince Rainier III, book alleges

2 years ago 38

Princess of Monaco Grace Kelly was involved in a promiscuous love affair and was caught cheating with millionaire playboy Aly Khan, according to the "Hitchcock's Blondes" book.

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3. Grace Kelly was caught cheating with another royal playboy before marrying Prince Rainier III, book alleges