Swift and Lively were seen cheering and celebrating as the Chiefs scored a touchdown in the first quarter.
Swift later shared a moment with Kelce's mom, Donna Kelce.
Swift previously cheered on Kelce at the Chiefs and Chicago Bears game last week in Kansas City, Mo.
Swift and Kelce were first linked in July after Kelce attended Swift's Eras tour concert in Kansas City. Dating rumors have picked up over the past two months.
Swift split from actor Joe Alwyn in April, while Kelce broke up with sports journalist Kayla Nicole in 2022.