Taylor Swift, Brittany Mahomes and Ashley Avignone cheer on the Chiefs at Gillette Stadium in Foxborough, Massachusetts, on December 17.Photo:Maddie Meyer/Getty

Taylor Swift, Brittany Mahomes,

Maddie Meyer/Getty

Taylor Swiftis continuing to prove herself as the ultimate supportive girlfriend toTravis Kelce.

The singer, 34, once again spent her Sunday cheering on the Chiefs with her new BFFBrittany Mahomes.

Swift and Mahomes, 28, sat together in a suite as theywatched the Chiefs defeat the New England Patriotsat Gillette Stadium in Foxborough, Massachusetts, on Sunday.

Swift worea knit Chiefs beanie— embroidered with her boyfriend’s jersey number, 87 — with a gray team shirt, a skirt and her classic red lip, while Mahomes wore a black turtleneck and pants, and kept cozy in a fluffy white coat for much of the game.

Brittany Mahomes' Instagram Story post.Brittany Mahomes/Instagram

Brittany Mahomes

Brittany Mahomes/Instagram

Since Swift started dating Kelce this summer, she and the wife of Chiefs quarterbackPatrick Mahomeshave spent many Sundays together cheering for the reigning Super Bowl champs — so much so thatthey’ve even got a special handshake.

They’ve alsobroadened their friendshipbeyond football stadiums. The two women have been spotted enjoyingnights out in New York City together with Swift’s friends, includingSophie TurnerandBlake Lively, as well asnights out with other Chiefs wives.

A source told PEOPLE that “everyone had a blast"when Brittany joined Swift’s pals in New York two months ago. “They all got along and were just laughing all night over drinks and delicious food,” the source said.

Taylor Swift and Brittany Mahomes cheer on the Kansas City Chiefs at Gillette Stadium in Foxborough, Massachusetts, on December 17, 2023.Maddie Meyer/Getty

Taylor Swift, Brittany Mahomes

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The tight end had mandatory practice on Wednesday, when Swift turned 34, and PEOPLE confirmed that he had to be in Kansas City. The couple had instead celebrated her birthday a few days earlyat a team partyfollowing the Chiefs loss against the Buffalo Bills last week.

They were spotted posing with partygoers and exchanging sweet kisses in group photos throughout the evening — and Kelce’s barber latershared a photo that Swift took herselfas the NFL star got a pre-game haircut.

source: people.com