Source Says Kourtney Kardashian & Travis Barker Are 'Like High School Sweethearts'

Kourtney Kardashian and Travis Barker's romance is like no other!

The reality star, 42, and her rockstar fiancé, 46, are like teenagers in love, per a source. The couple started officially dating earlier this year after being friends for a long time. They became Instagram-official in February following their outing over Valentine's Day weekend.

Since then, Kardashian and Barker have been inseparable, and they got engaged two months ago.

The "Keeping Up With The Kardashians" alum's view on marriage was changed by the Blink-182 drummer in just a couple of months. Her ex Scott Disick, 38, whom she dated for 10 years, proposed to her in the past but turned him down because of his erratic behavior.

"Her thoughts definitely changed when she and Travis became official. Those two spend all their time together and are madly in love," a source told People.

"She's over the moon," the same insider continued. "They're almost like high school sweethearts all over again. Neither of them ever thought they'd fall in love like this again."

The Poosh founder is "head over heels in love" with Barker because of how he treats her three children, Mason, 12, Penelope, 9, and Reign, 7, whom she shares with the Talentless creator.

"He's so sweet and loving towards her and her children," the source stated. "Their families also blended easily and nicely, and they all get along so well."

In a recent interview with Nylon, Barker shared how he helped Kardashian's daughter play the drums.

"You can't be pushy, but you're like, 'Oh, do you want to learn to play something?'" Barker said about Penelope. "And she's always bright-eyed and like, 'Yes, like I'm so excited to learn how to play.' So she caught on really quick, like super quick."

Apart from being longtime friends, Kardashian and Barker are also neighbors. That said, the mother of three has witnessed the father of two's relationship with his kids, Landon Asher Barker, 18, and Alabama Luella Barker, 16, whom he shares with ex-wife Shanna Moakler. Barker is also close with his stepdaughter Atiana De La Hoya, 22, and has remained to be there for her despite splitting from her mom years ago.

"She fell for Travis because he's such a there-for-his-kids father," the insider stated. "He has a huge heart."

Their blended family has already bonded multiple times, even before their engagement. Last month, they took the children to Mexico to celebrate Barker's 46th birthday. The Kardashian-Barker bunch has also traveled to Disneyland a couple of times.

Kardashian and Barker got engaged at the Rosewood Miramar in Montecito, California, on October 17. The latter popped the big question to the love of his life while surrounded by dozens of roses and candles.

"Travis took Kourtney for a walk, and you could tell that she wasn't sure what was going on when she saw all the roses on the beach," an insider told the outlet. "Red and white roses were shaped into a heart. There were a lot of candles. They both looked very happy."

A family friend also added, "It was a complete surprise for Kourtney. Travis told her family that he planned to propose, but everyone was great at keeping it secret."