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

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Grace Kelly's son, Prince Albert, says he has always felt a sense of responsibility to protect the late star.

The prince of Monaco also detailed how the Princess Grace Foundation-USA is working to help aspiring artists today in honor of the former Hitchcock muse.

Life wasn’t always a fairytale for Hollywood sweetheart Grace Kelly. 

Before tying the knot with Prince Rainier III of Monaco, the Oscar winner allegedly had a promiscuous past as she charmed a number of men with her beauty. 

"Despite her upbeat attitude, Grace was a far more complex person than most around her imagined, and far more manipulative than her angelic face might suggest," author Laurence Leamer wrote in his new book "Hitchcock’s Blondes" obtained by Fox News Digital.

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Before tying the knot with Prince Rainier III of Monaco, Grace Kelly allegedly had a promiscuous past as she charmed a number of men with her beauty.  (Getty Images)

"People huddled around her, seeking her attention, and she knew how to use them."

As a teenager, Kelly was involved in a love affair with her 30-year-old teacher Don Richardson while studying at New York City’s American Academy of Dramatic Arts, according to Leamer. 

Kelly was reportedly head over heels for Richardson and even introduced him to her parents. However, they didn’t approve of the drama teacher, since he was still legally married but separated from his wife. 

While lining up lovers including Claudius Charles Phillippe and the banquet manager of the Waldorf Astoria Hotel, Leamer alleged Kelly was involved with another millionaire playboy, Aly Khan, at the same time she was "seriously" dating Richardson. 

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. (Penguin Random House)

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Although Khan was married to Rita Hayworth at the time, Richardson noticed that Kelly had donned a piece of jewelry that led to his beliefs about her affair with Khan. 

"One evening, Grace invited Richardson over to the apartment . . . As always, they made love," Leamer began to explain.

"Afterward, she pirouetted before him in one gorgeous gown after another. He had no idea where she’d acquired such outfits. Then she paraded before him nude, except for a gold bracelet laden with emeralds."

Kelly starred in 11 films before marrying Prince Rainier III and becoming the Princess of Monaco. (FilmPublicityArchive/United Archives via Getty Images)

Leamer continued to write that Richardson recognized the bracelet from another woman, who wore the same piece of jewelry and had slept with the wealthy foreign diplomat. 

"[Khan] was famed for his generosity as much as for his sexual prowess," and the bracelets "were tokens of appreciation. With so many lovers, it made sense that, as often as not, he passed out the same gift."

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Despite Richardson having other lovers at the time, he was still fueled with anger and threw the bracelet into a fish tank and immediately broke it off with Kelly, according to Leamer. 

Wedding of Rainier III, Prince of Monaco to Princess Grace on April 19, 1956, in Monaco. (Gilbert TOURTE/Gamma-Rapho via Getty Images)

"Does the bracelet have anything to do with it?" Kelly questioned.

"It has everything to do with it," Richardson responded.

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"Maybe Grace would be crying or wringing her hands in despair," Leamer wrote. "But it was nothing like that. Still nude, she was reaching down into the water to fish out the bracelet."

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Grace Kelly and Cary Grant on the set of "To Catch a Thief" directed by Alfred Hitchcock. (Getty Images)

Kelly rose to fame while starring in several of Alfred Hitchcock’s films, including "Dial M for Murder," "To Catch a Thief" and "Rear Window."

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In 1956 at age 26, Kelly left behind Hollywood fame to become a princess when she married Prince Rainier III of Monaco.

After a whirlwind courtship, the prince and the actress married less than a year later. Rainier and the newly minted Princess Grace shared three children: Princess Caroline, Prince Albert and Princess Stephanie.

Kelly died in 1982 from injuries she sustained in a car crash. She was 52.