Kelce had fans in hysterics when he belted out a rendition of “Viva Las Vegas” on stage.
He then yelled the signature words from the popular Beastie Boys song, “You gotta fight for your right to party.”
The Chiefs had to show composure to recover from a 10-0 first quarter deficit to fight back and take the game to overtime.
Mecole Hardman then dramatically caught the winning touchdown with just seconds remaining.
The Grammy winner held her breath as she watched the final nerve-shredding stages of the game, with her beau’s team the Chiefs winning over the San Francisco 49ers 25-22 in Sin City with seconds to go – sending her into wild celebrations.
But the night was full of twists and turns that kept spectators on the edge of their seats. Shortly before half-time the Chiefs were trailing the opposition prompting an outburst from Kelce.
He screamed in the face of Chiefs head coach Andy Reid and nearly knocked the 65-year-old off his feet before being hauled away.
It was shocking and threatened to become the defining image of a night when Kansas City unravelled and spurned a chance to make history.
The tense game unfolded in front of a star-studded crowd with American rapper Jay-Z taking pictures of his daughters Blue Ivy and Rumi on the pitch before the game kicked off and then joining his wife Beyonce in the stands.
Justin Bieber, who had been rumoured to appear as a guest singer during the half-time show, and his model wife Hailey were filmed dancing during Usher’s performance, while Leonardo DiCaprio, Lady Gaga and Lana Del Ray also enjoyed the day out. Beatles legend Sir Paul McCartney spotted chatting away in Swift’s £1.6million suite.