"Kourtney and Travis are in total lust over each other and she doesn’t regret going public with their relationship at all," the source said. "The relationship was a long time coming because the attraction has always been there on both sides. They love the fact that they have a true friendship and bonded that way before taking anything further and making things romantic."
ET learned in January that Kardashian and Barker had started dating after years of being friends. During an appearance on The Drew Barrymore Show last week, Barker said the pair's relationship "comes natural," especially since they're both parents.