Swift's enthusiasm at her first Chiefs game seemed to confirm her rumored romance with Kelce.

Swift later said they were already an official couple before she watched the Chiefs beat the Chicago Bears.

"This all started when Travis very adorably put me on blast on his podcast, which I thought was metal as hell," she told Time. "We started hanging out right after that. So we actually had a significant amount of time that no one knew, which I'm grateful for, because we got to get to know each other."

"By the time I went to that first game, we were a couple," Swift continued. "I think some people think that they saw our first date at that game? We would never be psychotic enough to hard launch a first date."

Swift and Lively watched the Chiefs defeat the New York Jets at MetLife Stadium in East Rutherford, New Jersey — where Swift had performed three sold-out concerts just a few months prior.

The October game drew the highest viewership for a Sunday TV show since the Super Bowl, NBC Sports reported.

Indeed, Swift's newfound interest in football has been credited with bumping merch sales and enticing more female viewers.

Shortly before her third game-day appearance, Kelce accused the NFL of "overdoing it" with its wall-to-wall coverage of Swift.

"I think it's fun when they show who all is at the game. I think it brings a little more to the atmosphere, brings a little bit more to what you're watching," Kelce said during an episode of his "New Heights" podcast.

"But at the same time, I think they're overdoing it a little bit," Kelce continued. "For sure, especially for my situation. I think they're just trying to have fun with it."

Just a few days before the release of "1989 (Taylor's Version)," the rerecorded version of her fifth album, Swift watched the Chiefs take down the Los Angeles Chargers.

She spent the home game cheering with Mahomes and showing off their secret handshake.

Swift spent most of November 2023 on the road for the South American leg of The Eras Tour. Kelce even flew to Buenos Aires, Argentina, to watch Swift perform — and received an onstage shout-out in return.

She returned to Kelce's side in early December when the Chiefs took on the Green Bay Packers. It was her first time watching Kelce's team lose.

Swift purchased the '90s sweatshirt from Westside Storey, a secondhand clothing boutique in Kansas City.

The store's owner, Chris Harrington, told Business Insider he originally thought Swift's order — which totaled $1,200 for curated vintage pieces — could be fraudulent.

Instead, she wore one of those pieces at Arrowhead Stadium in December, causing a surge of traffic to Westside Storey's website.

"We've had hundreds of orders over the last 48 hours," Harrington told BI. "Sometimes our online store lights up after a Chiefs game when we win, but this is 100 times more than that, and we lost the game. It was the Taylor effect."

Swift hit the road to watch the Chiefs defeat the New England Patriots on the latter's home turf. She even convinced her father, Scott Swift, to swap his traditional Philadelphia Eagles gear for a Chiefs sweatshirt.

Several friends accompanied Swift, including Alana Haim, stylist Ashley Avignone, and backup singer Melanie Nyema.

Even though the Chiefs lost to the Las Vegas Raiders on December 25, 2023, Kelce praised Swift and her family for making the day special.

The singer's brother, Austin Swift, even gave him a sentimental gift while dressed as Santa Claus, Kelce shared on his podcast.

Swift wore a Chiefs varsity jacket for the game against the Cincinnati Bengals, which the home team won.

The Chiefs defeated the Miami Dolphins during the fourth-coldest game in NFL history, according to CNN.

That same day, the Chiefs owner praised Swift and Kelce's "purely organic" relationship.

"It's been a very interesting, very fun year having the two of them dating, the attention that's been focused on the Chiefs," Clark Hunt told CNBC. "Our female audience has grown leaps and bounds."

Swift joined Kelce's family to watch the Chiefs advance through the NFL playoffs — including his brother, Eagles center Jason Kelce, who lost his shirt in the frenzy.

Swift watched the Chiefs beat the Baltimore Ravens in the 2024 AFC Championship Game, securing their spot in Super Bowl LVIII. She even joined Kelce on the field to celebrate the win.

Swift was widely expected to attend the 2024 Super Bowl in Las Vegas, despite having an Eras Tour stop scheduled in Tokyo the night before.

Sure enough, she made the trip in time to watch the Chiefs take on the San Francisco 49ers, with friends like Lively, Lana Del Rey, and Ice Spice in tow.

Swift was back in Kansas City on the evening of September 5, 2024, as the Chiefs took the field for their first game of the season against the Baltimore Ravens.

She donned an all-denim getup and thigh-high red boots.

Just a few days after attending the MTV Video Music Awards in New York (and giving her boyfriend a shout-out onstage), Swift was back in Kansas City to watch the Chiefs defeat the Cincinnati Bengals.

After skipping two of Kelce's games in Atlanta and Los Angeles, Swift returned to Kansas City in style — wearing over $50,000 worth of jewelry and designer clothing — to cheer for the Chiefs against the New Orleans Saints.

The home team won 26-13, their fifth consecutive win of the season.

One day after Swift wrapped the final US leg of the Eras Tour in Indianapolis, she was back in Kansas City to watch the Chiefs take on the Tampa Bay Buccaneers.

Despite a touchdown from the Buccaneers in the final minute of regulation play, the Chiefs rallied in overtime to score a winning touchdown.

Swift wore her typical black-and-red combo for another home game at Arrowhead Stadium, pairing a Victoria's Secret corset with a Versace tweed two-piece set. She was joined in the VIP box by her mother, Andrea Swift.

Swift arrived at Arrowhead Stadium with Kelce's mom, Donna. The pair cheered as the Chiefs clinched a narrow defeat against the Los Vegas Raiders.

Swift wore her boldest gameday outfit yet for the Chiefs vs. the Houston Texans, pairing a statement red coat with a faux fur lining from Charlotte Simone with a vintage Chanel bucket hat.

Kelce and the Chiefs beat the Texans 19-27, adding another win to their dominant season. (To date, the Chiefs have only lost three times with Swift in the stands.)