And they expect us to believe that they're NOT back together?!

On Friday night Kourtney Kardashian and Scott Disick gathered up their three children and hopped on a private jet, and he was doing a paid appearance at 1OAK in Las Vegas, so it seems odd that the fam would be tagging along. So what were they up to?

Kourt and Scott took Mason, 6, Penelope, 3, and baby Reign, 17 months, to see Cirque du Soleil’s The Beatles LOVE show at The Mirage, and after that they tucked their youngest kids in to bed and brought Mason out for dinner at Stack.

“Scott led the family in while Kourtney, wearing a black dress, held Mason’s hand as they arrived,” a source tells Us Weekly. “Despite being so late, Mason was excited. He was a rock star. He skipped and jumped as he walked in holding hands with Kourtney. They were relaxed and very loving. They were out to have fun as a family and made sure Mason did too.”

The duo split last July, and though Scott has been linked to a string of new love interests over the last year, it doesn't seem as though he's dating anyone at the moment. Hmm...do you think he's back with Kourt?