Trending Now: The cringe party that saved Will and Kate’s union  - Fans React

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Prince William won back Kate Middleton after their 2007 breakup when they pair attended a wild bash where she dressed as a “naughty nurse,” Wonderwall.com can report.

The two ended up having a deep conversation after peeling away from other partygoers, helping them decide to give their romance another try, according to a new book.

That led to a rock-solid relationship that culminated in the college sweethearts finally marrying in a 2011 royal wedding.

The breakup

Kate Middleton was photographed out and about in London a month after her split from Prince William in 2007. By: MEGA

William and Kate split in March 2007 after dating for several years. They’d met in 2001 while students at the University of St. Andrews in Scotland.

While the future Princess of Wales “wasn’t demanding an engagement,” she “wanted a commitment, and if he couldn’t deliver that, well, then she left him in no doubt that it was best they go their separate ways,” author Russell Myers wrote in his new royal biography, William and Catherine: The Monarchy’s New Era: The Inside Story.

The ultimatum didn’t go Kate’s way.

In a heartbreaking 30-minute phone call, William “laid out his reasons for believing they were on different pages” and couldn’t give her the answer she hoped for, leaving Kate “understandably devastated,” according to Myers.

Kate enjoyed the single life

Kate Middleton lived her best life in London following her split from Prince William in the spring of 2007. By: MEGA

Kate Middleton lived her best life in London following her split from Prince William in the spring of 2007. By: MEGA

William went so far as to have Clarence House release a statement confirming that he and Kate were no longer together. He allegedly confided to one senior courtier, “at least she is free,” according to Myers.

Kate hardly sat at home wallowing in her tears.

Instead, she hit the London nightlife scene as a single woman and was frequently seen partying with her pals.

“If her intention was to make William jealous, it had the desired effect,” Myers noted.

William realized his mistake

Prince William realized he made a mistake breaking up with Kate Middleton, who enjoyed partying with friends in London during their brief 2007 split. By: MEGA

Prince William realized he made a mistake breaking up with Kate Middleton, who enjoyed partying with friends in London during their brief 2007 split. By: MEGA

When Kate was on vacation in Ibiza, Spain, with her family in June 2007, William texted her to see if she would agree to talk to him.

Both were planning to attend a party at the home of a mutual friend. The cringey theme for the evening? “Freakin’ Naughty.”

William and Kate agreed to meet up at the bash, which would mark the first time they’d seen each other in months.

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He dressed to impress in “tight black hot pants and a plastic policeman’s helmet,” according to Myers, while she donned “a show-stopping ‘naughty nurse’ outfit, complete with fishnet stockings and a short dress.”

Fellow partygoers said that as soon as the pair locked eyes at the party, “it was clear their love had not extinguished,” the author explained.

Reunited at last

Kate Middleton and Prince William married in London on April 29, 2011, nearly a decade after they met as university students. By: MEGA

Kate Middleton and Prince William married in London on April 29, 2011, nearly a decade after they met as university students. By: MEGA

William and Kate sneaked away from the other guests and “spent hours locked in deep conversation,” according to the book.

Myers wrote how “Catherine listened intently as William attempted to break the deadlock, laying out his reasons for doubting what they had. He talked of his fear of letting someone truly experience the world in which he lived, and also his fear of rejection if he did let himself get too close.”

The author continued, “Catherine, of course, knew that she still loved William deeply. That was why she had been so explicit in her demands. She was willing to agree to a future, if only he would stop allowing outside factors to affect his judgment.”

They returned to the party a couple once again, this time with a promise that their future together was solid.

After the couple’s wedding, the friend who hosted the bash spoke about how it brought William and Kate back together.

“There’s an idea that I was like Cupid with a bow and arrow. People love the idea that somebody put them back together, but they put themselves together far more,” former jockey Sam Waley-Cohen said, as reported by the Daily Mail.