A picture of the Chiefs star walking into the Lucas Oil stadium surfaced on social media late Saturday night.
He was reportedly sat in the same suite as WNBA star Caitlin Clark, who was watching Swift’s show for the second straight night.
And other fan footage from the show saw Kelce singing along next to Swift’s mother, Andrea, during the performance.
Kelce’s appearance comes shortly after Jason’s shock incident earlier in the day, where he slammed a fan’s phone to the ground for calling the Chiefs star ‘a f****t’ for dating the singer.
A source close to the couple told DailyMail.com: ‘Taylor and Travis were both really shocked by this considering Jason is one of the nicest guys in the world.
‘It really became clear how much he loves and respects Taylor. Travis means the world to him.
‘The use of the word f****t is not okay with him nor anyone. This fan crossed the line. Jason will never stand for anyone insulting his family and he views Taylor as family now.’
The older Kelce brother and recently retired NFL star was at Penn State on Saturday for the school’s huge college football game against Ohio State. He had earlier made an appearance on ESPN’s ‘College GameDay’.
Kelce, a Super Bowl winner, is something of a cult hero in football after his illustrious 13-year career in the NFL and his booze-fueled antics.
He is regularly among fans at football games without trouble and has enjoyed boozy tailgates on numerous occasions. Kelce’s response is indicative of how close the brothers are, however.
Their relationship is at the core of their smash-hit New Heights podcast and Jason regularly supports his younger brother at Chiefs games and major events.
Jason has also been to a number of Swift’s Eras Tour shows – both with Travis and his own young family – as they have embraced the popstar ever since her relationship with Travis became public knowledge in 2023.
Kelce and the Chiefs are not in NFL action until Monday night in Kansas City, when they host Tampa Bay Buccaneers at Arrowhead Stadium.
Jason is expected to be at that game in new role as an NFL analyst for ESPN on Monday Night Football – the game is also the night before his 37th birthday.
Swift could be free to attend that game as well.
She rounds off her weekend of shows in Indiana on Sunday night – her last Eras Tour date in the United States. Her calendar appears clear to return to Kansas City to cheer Kelce on in the NFL.
The Chiefs are 7-0 so far this season, with Kelce and his team in pursuit of what would be an historic third straight Super Bowl title.