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Jackie Kennedy Onassis had an unforgettable night with Alec Baldwin.

The former first lady’s pal Carly Simon released a new memoir on Tuesday titled “Touched by the Sun: My Friendship with Jackie," which details Onassis’ thoughts about both of her husbands — President John F. Kennedy and Aristotle Onassis — as well as her two children.

But the celebrated singer also made a revelation about one night to remember involving the Hollywood actor and the former first lady.

In the book, the 74-year-old recalled when she and then-husband James Hart were joined by Onassis and her unlikely date. People magazine reported on Tuesday that according to Simon, Baldwin ended up as a last-minute plus-one for Onassis when her partner Maurice Tempelsman was out of town.

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Good friends Carly Simon and Jackie Onassis pose for a picture at Bunch of Grapes Bookstore on Martha's Vineyard, Massachusetts, 9/2/89.

Good friends Carly Simon and Jackie Onassis pose for a picture at Bunch of Grapes Bookstore on Martha's Vineyard, Massachusetts, 9/2/89. (Photo by Stephen Rose/Getty Images)

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The outlet shared both Ken Burns and media exec Joe Armstrong passed up on the opportunity. However, Baldwin, now 61, had no qualms about being third in line. In fact, he happily joined the group to attend “Dancing at Lughnasa” on Broadway.

“Alec, who had never met Jackie, was in a state of hyper-disbelief,” wrote Simon, as the outlet shared. “’Jackie Kennedy wants to go on a date with me?’ he said. ‘Are you kidding?’ Alec’s incredulity gradually gave way to ‘What should I wear?’”

However, the group knew that the night out would cause mayhem among paparazzi. So, they decided to keep their identities a secret during the night by wearing wigs Simon had on hand.

“Jim, brave-faced and laughing, was the first to put his on, a long, curly, Eddie Van Halen wig that prompted a chorus of laughter,” recalled Simon. “Alec chose a short, brown one; mine was comely, blond, and Grand Ole Opry-esque, and Jackie reached impulsively for the one befitting Madame de Pompadour.”

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Alec Baldwin during "The Spirit of Liberty" Awards Dinner & the 10th Anniversary Celebration of People for the American Way at Waldorf Hotel in New York City, New York, United States.

Alec Baldwin during "The Spirit of Liberty" Awards Dinner & the 10th Anniversary Celebration of People for the American Way at Waldorf Hotel in New York City, New York, United States. (Photo by Ron Galella/Ron Galella Collection via Getty Images)

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Simon shared that Onassis was “at peace” that night.

“As anticipated, Jackie doted on Alec, and Alec, despite his been-there, seen-everything show business poise, occasionally revealed the lightest possible slick of sweat on his brow.

“First thing next morning, Jackie called to tell me what a magical evening it was, how divine Alec was, and how important she felt it was to think and act and cavort like a child now and again,” continued Simon.

Back in 2017, Hart told Fox News it was Onassis who made the special request to spend a night out with Baldwin for her 62nd birthday.

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(Original Caption) Mrs. Jacqueline Onassis was one of a group of prominent New Yorkers who joined the fight to save Grand Central Station during a meeting to fight construction of an office building atop the New York City landmark.

Jackie Kennedy Onassis in 1975. (Getty)

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“We told her, ‘Look, we don’t want to do the usual dumb thing. What would you like for your birthday?’” he said. “And a couple of days later, she called Carly and said, ‘Is Jim friends with Alec Baldwin? Is that true?’ Carly said 'yes' and she said, ‘Do you think Alec would be my date for my birthday?’ I called Alec and he said, ‘Absolutely! I’m there!’ And so, we went to the theater. He was more of her escort than a date. But it was such a fun evening.”

According to Simon, it was Onassis’ son John F. Kennedy Jr. who introduced his mother to her on Martha’s Vineyard back in 1983. The two remained close until Onassis’ death in 1994 at age 64.

While Onassis was 16 years older than Simon and notoriously private, it didn’t take long for her to open up to the singer.

Simon said Onassis even talked about President Kennedy’s adultery.

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Former United States President John F. Kennedy and first lady Jackie Kennedy attend a dinner in honor of Andre Malraux, minister of state for cultural affairs of France, in Washington, in this handout image taken on May 11, 1962. November 22, 2013 will mark the 50th anniversary of the assassination of President Kennedy. REUTERS/Robert Knudsen/The White House/John F. Kennedy Presidential Library  (UNITED STATES - Tags: POLITICS ANNIVERSARY)    ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS - RTX15FKN

Former United States President John F. Kennedy and first lady Jackie Kennedy attend a dinner in honor of Andre Malraux, minister of state for cultural affairs of France, in Washington, in this handout image taken on May 11, 1962. (Photo by REUTERS/Robert Knudsen/The White House/John F. Kennedy Presidential Library)

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“[She] understood that he made some stupid mistakes,” said Simon. However, she told the outlet that Onassis brushed off the affairs because “she knew he loved her more, much more.”

Onassis also got candid about her second husband, Onassis, whom she married in 1968 — five years after Kennedy’s 1963 assassination.

“She said he was very sexy — he would sing to her on his yacht and take her great places to make love,” Simon recalled. “She knew marrying him was the bad-girl move. In a way, I never knew whether she was sticking up for her own decision or whether she really loved him.”