Kourtney Kardashian Fell Hard For Travis Barker Because Of THIS!

Travis Barker caught Kourtney Kardashian's heart by being the best dad.

The "Keeping Up With The Kardashians" star, 42, and the Blink-182 drummer, 46, have been inseparable since hooking up earlier this year. The couple even got engaged in October.

Kardashian was in a longtime relationship with her ex and baby daddy Scott Disick, 38, but she turned down his marriage proposal. She was not opposed to marriage, but his ways made her rethink her future with him. But with Barker, the reality star said "yes" to him without hesitations.

According to a source, Kardashian is "head over heels in love" with Barker, not just because he's "hot and attractive," but because of the way the musician treats her three kids, Mason, 12, Penelope, 9, and Reign, 7.

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

Kardashian and Barker have been friends for a very long time, and they're also neighbors. Through the years, she saw his loving relationship with his two children, Landon Asher Barker, 18, and Alabama Luella Barker, 16, whom he shares with ex-wife Shanna Moakler. He has also been such a great stepfather to Atiana De La Hoya, 22, daughter of boxer Oscar De La Hoya.

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

Both Kardashian and Barker have spent time with each other's kids, and sometimes they take their blended family together on trips, as seen on social media. Just last month, the couple took their children on a family trip to Mexico in celebration of Barker's birthday. However, Disneyland might be their favorite family destination as the pair took their kids to the happiest place on earth multiple times.

Barker proposed to Kardashian on a romantic, beachside location at the Rosewood Miramar in Montecito, California. He had red dozens of roses placed at the venue, complete with candle lights.

In August, Barker took his first plane ride in 13 years following his near-death experience with an aircraft. The rockstar survived a deadly plane crash with his friend and longtime collaborator, Adam "DJ AM" Goldstein, as per BuzzFeed News. Their private jet crashed during takeoff at an airport in South Carolina.

His love for Kardashian made him overcome his fear of flying. He opened up about it in an interview.

"I didn't even know I was going," Barker told Nylon. "I made a deal with her that she had just said to me, ‘I would love to do so much traveling with you. I want to go to Italy with you. I want to go to Cabo with you. I want to go to Paris with you. I want to go to Bora Bora with you.’ And I said, ‘Well, when the day comes you want to fly, I'm telling you I'll do it with you. I would do anything with you. And just give me 24 hours’ notice.’ And that's what she did."