Kourtney, 41, and the drummer, 45, first fuelled romance speculation last week when they both shared photos from the swimming pool at the Kris Jenner's Palm Springs home.
Not long before that, eagle-eyed fans were also trying to decode the meaning behind the red rose emoji that Barker left on one of her Instagram posts.
While the match might not have been predicted by many, the pair have long moved within the same social circles and lived in the same Calabasas gated community.
Kourtney has three children with her ex-partner, Scott Disick, whom she separated from in 2015.
Barker has two children from a previous relationship.
