"He had two specialty drinks at the party," a source tells E! News, adding that he wasn't acting crazy.
In fact, Scott and Kourtney seemed to be perfectly happy and even made an early exit from the bash to go take care of baby Mason.
But it's not all reality TV roses. From the sounds of it, the two did split (again) for some time.
In the upcoming season of Keeping Up With the Kardashians (premiering Aug. 22 on E!), Kourtney briefly moves in with Khloé and Lamar before deciding to move out again after her sister won't let Scott into the house when he comes to visit.
Kourtney admits she had a tough time watching last night's show, when Scott snapped and she took off with Mason and Kim.
Are you glad to see Kourt getting along again with her baby daddy or is it time for her to leave him for good?
Sound off on Scott and his unique fashion sense in our Scott Disick: Dig Him or Diss Him? gallery!