Sources with direct knowledge tell us Taylor and Chiefs' QB Patrick Mahomes' wife, Brittany Mahomes, really hit it off Sunday night at Kelce's private post-game party. Our sources say the two chatted a ton at the bash ... and at one point even took a shot together.

What's more, we're told, Brittany and Taylor were overheard saying they wanted to stay in touch ... and have plans to meet up again in the near future.

Of course, Taylor's supposed to attend this Sunday's Chiefs game against The New York Jets at MetLife Stadium in New Jersey ... so they'll at least see each other at the game.

Brittany aside, Taylor also spent plenty of time with Travis at the party ... and could be seen with her arm draped around the NFL star in a photo we obtained from inside the event.

Brittany and Patrick's brother, Jackson, have been the faces of the KC team for years now (other than the athletes, of course) so to see Taylor take the spotlight has certainly been a shift in power.

Social media went wild during Taylor's appearance at Sunday's game when she sat in a private booth next to Travis' mom, Donna. Brittany wasn't in that box, but memes started popping up questioning whether or not she was jealous of the attention on Taylor.