Remember when Kourtney Kardashian went BALLISTIC on Scott Disick after he introduced their kids to his girlfriend Sofia Richie BEFORE he and Kourt had decided it was okay? In case you've forgotten, the gist of it was the Scott's a jerk and doesn't follow the rules and Kourtney runs the show. What's new?!

Well the incident hasn't slowed down Scott and Sofia Richie's relationship one bit ... in fact, since Sofia got implants, the couple's relationship seems to be next level!

We "caught up" with the couple at the movies Saturday afternoon in Calabasas and let's just say Sofia has a certain confidence now that she's moved on from being a teen to officially being a 20-something ... or just 20. And perhaps the new cup size doesn't hurt either!