Kate Middleton's fairytale could have been a different story, with the Dutchess having once split from Prince William.

In a new book, "Kate" by Michael O'Mara, new and never-before-heard details reveal that the adorable couple, who will soon welcome their first child, almost never happened. According to Hollywood Life, their royal relationship was once hanging by a thread before the Duke of Cambridge "came to his senses."

The tell-all breaks down their 2007 split and subsequent reconciliation in full. It describes just how the couple had come to a serious fork in the road after dating four years.

"When his father Charles was wooing Diana and the relationship reached a crossroads, Prince Philip told him that he needed to take action one way or another," read an excerpt from the book. "And Charles proposed. When William was faced with a similar dilemma he went the other way."

In shocking detail, "Kate" reveals how devastated Middleton was over the breakup, which William made worse. The royal went to a "London nightclub, flirted with countless girls and even stood on a table at one point and screamed, 'I'm free!'"

But Kate rebounded by going out more and doing her "own share of flirting," O'Mara wrote. "Her dresses grew shorter, her tops lower...Once inside a party she put on a pair of pink silk bunny ears and proceeded, as one partygoer put it, to 'tease all the boys.'" And after she evened the playing field, William came to the realization that would change both of their lives forever.

Compelled by his father's disappointment over not marrying his first love, Camilla, the Prince had an "aha" moment that Middleton had everything that he needed and wanted. He attempted to get back in her good graces, which we know he ultimately did.

"We were both finding ourselves and being different characters," Prince William stated. "It was very much trying to find our own way and we were growing up so it was just a bit of space and it worked out for the better."

After reuniting with the promise of forever in their hearts, "Kate" recounted the days leading up to their highly-publicized engagement: "Kate and William had a lot to discuss, and some lost time to make up for...For the next few years, they would work and enjoy their lives, knowing that at some point when the time was right, they would be husband and wife - and perhaps parents too."

And the rest is history. Tell us what you think of the royal couple's love story in the comments section below!