In the second quarter, Mahomes found tight end Kelce with a 23-yard throw.
Although it was Kelce's first significant play of the game, Mahomes made history with it.
Swift jumped out of her seat as soon as Kelce made the catch and gave a big hug to Kelce's mother, Donna, who was sitting next to her during Thursday night's 27-20 victory over the Baltimore Ravens.
When Mahomes hit Kelce in the second quarter, he only needed 84 yards to surpass Dawson, who finished with 28,507 yards while playing for the Chiefs.
Seven-time Pro Bowl quarterback Dawson spent fourteen of his nineteen NFL seasons as a member of the Chiefs (he spent one season with the Dallas Texans
After supporting Kelce and the Chiefs in 13 games during the previous season as they won their second consecutive Super Bowl, Swift, meanwhile, was back at Arrowhead.
Although she and Patrick's wife, Brittany Mahomes, supported the Chiefs together at a number of games last season, she was not spotted sitting next to each other.
It comes after Brittany openly supported Donald Trump to win the election later this year; Swift,