Swift made it clear who she was rooting for in an $1,800 red-and-white varsity jacket paired with a matching red beanie and her signature red lipstick.

Jason looked spirited in a red T-shirt boasting Travis’ nickname, “Big Yeti.”

Kylie (far right) kept warm in a black coat.USA TODAY Sports via Reuters Con

Brittany Mahomes (center) also joined the Chiefs crew.Mark J. Rebilas/USA TODAY Sports via Reuters Con

The graphic tee ($32) is a part of the merch collection for Travis and Jason’s “New Heights” podcast.

As for Kylie, she kept warm in the suite in a black coat.

This is the first time that Swift, 34, has been spotted hanging out with Travis’ sibling despite growing quite close to his parents, Donna and Ed Kelce, who also joined the crew.

Swift often attends her boyfriend’s matchups alongside his parents, Donna and Ed Kelce.Getty Images

Travis’ game against the Buffalo Bills is win or go home.Getty Images

It’s unclear if this is the “All Too Well” singer’s first time meeting Jason, 36, and Kylie or if they have already become acquainted in a more private setting.

Sunday night’s divisional round matchup is the first one of Travis’ games that Jason has attended this season due to his own busy football schedule.

The father of three, who is considered the best center in the NFL, plays for the Philadelphia Eagles. However, his season came to an end last week following a loss to the Tampa Bay Buccaneers.

This is the first one of Travis’ games that Jason and Kylie have been able to attend this year.Getty Images for Prime Video

Jason’s season with the Philadelphia Eagles ended last weekend.Instagram/@kykelce

Since then, there has been lots of speculation that Jason’s 13-year career may be coming to an end, leading many NFL fans — and Swifties — to pay tribute to the legendary center.

Several of Swift’s superfans took to social media earlier this week to wish the NFL star well — despite admittedly not knowing who he was before the pop star started dating his brother.

“why am i crying over some football player i’d never heard of 6 months ago,” one person tweeted in response to a video of Jason after the crushing loss.

It’s rumored that the center may retire after this season.REUTERS

It’s unclear if this was Swift’s first time meeting her boyfriend’s brother.Getty Images

“Here I am crying over the loss of Taylor’s boyfriend’s brother,” another wrote alongside a similar clip.

“Why am I sitting here crying over my emotional support pop stars boyfriends brother crying over maybe not playing football anymore. Make it make sense,” a third posted.

Some of Swift’s fans have jokingly dubbed Jason the “president of Tayvis nation” — Swift and Travis’ couple name — due to his interviewing skills during the brothers’ “New Heights” podcast.

The “Cruel Summer” singer has become somewhat of a staple at Travis’ games.TNS

Jason has been asking Travis the hard-hitting questions about his romance with the “Anti-Hero” singer ever since they started dating over the summer, inquiring about his time down in Argentina and prying into his holiday plans.

In fact, Travis may have Jason to thank for his relationship with the 12-time Grammy winner.

After the tight end attended one of Swift’s Eras Tour concerts in July, Jason was the one who asked him to elaborate on the experience during one of their podcast episodes.

The 12-time Grammy winner started dating the hunky tight end over the summer.APWhat do you think? Post a comment.

Travis explained that he tried — and failed — to give the pop star his phone number. He also claimed that she didn’t want to meet him.

However, Swift caught wind of Travis’ interest in her after the video went viral and decided to give the hunky athlete a shot.

Aside from Jason, several other people are rumored to have played a role in their romance, including Jason Sudeikis, Miles Teller and the singer’s cousin.