Breaking News: NFL Signs 2-Year, $65 Million Contract with Taylor Swift to Sing National Anthem; Patrick Mahomes Congratulates Travis Kelce and His Girlfriend

getting into the holiday spirit.

Locals spotted the couple at holiday pop-up bar Miracle in Kansas City on Friday night, where the Chiefs were holding a party.

News circulated online that Swift, 33, was in attendance at the team’s gathering, which seemed to be a costume party as many couples were wearing matching outfits.Saturday captioned, “Falalalalalalalalala🎄.”

Chiefs tight end Blake Bell and wife Lyndsay also sported matching looks in another photo that Brittany shared, indicating that many of the players and their dates wore coordinated outfits.

An onlooker told PEOPLE that Swift’s holiday song “Christmas Tree Farm” played at the party — which took place in a semiprivate back room of the venue — and confirmed that the singer was in attendance at the celebration with her beau Kelce, 34.

“Everyone looked happy and festive” and there was “great energy” at the party, the onlooker said.