Everett / REX Shutterstock / Rex USA 1 / 19
Everett / REX Shutterstock / Rex USA 1 / 19

Score one for Kourtney Kardashian in the predictions department.

Two months after she declared her sister Kourtney Kardashian and Scott Disick would eventually rekindle their romance, E! News reports the parents of three have done just that.

"They are back together and giving their relationship a try again," says a source, crediting Scott's newly minted clean living track record as the main reason for the new development.

Over the past year, Scott Disick's worked hard to shed his party-boy image, taking fewer nightclub gigs and backing off of drugs and alcohol.

"Scott's mellowed out a lot and hasn't been partying," says the insider.

Another source says the two "both want to work it out for their kids," Mason, Penelope and Reign.

The news comes on the heels of the on-off couple's kid-free vacation in Mexico together, which sparked rumors they'd reconciled, and a report claiming Scott was "on a mission" to win back the mother of his children.

After a number of brief splits over the course of nine years, Kourtney finally left Scott a year and a half ago, after he was photographed getting cozy with an ex while Kourtney was at home taking care of their kids.

Scott went to rehab after that for the second time in a year and eventually began cleaning up his image. It wasn't long before Kourtney allowed him back into her life and the lives of their children and her family.

"I feel like every day is different, but we're totally getting along. Like, we have three beautiful kids together … But, you know, he's family. He'll always be," she said on "Ellen" in January.

Three months later on "Today," she assured the show hosts romance was not on the table for her and Scott -- although she didn't say it would never happen.

"We're not getting back together right now," Kourtney said, "... but I don't know what the future holds in life, in God's plan. But we're just doing our best to be the best parents. Like, he came with us to Vail and it was great. But, like, we're friends at this point."

During their split, Kourtney was rumored to have been involved briefly with Justin Bieber, while Scott was spotted with various women, many of them younger, on his arm

None of those situations seemed to stick.

Speaking to Us Weekly in March, Scott admitted that breakup or not, Kourtney was still his No. 1 in many ways.

"I mean, she'll always be family to me and probably the person I love the most in the world," he said. "So even though we're not together, we're still close and it's still nice to be around each other."