Taylor Swift snuck into a football stadium to watch her fiancé Travis Kelce at work ... and it looks like she used a bullet-resistant portable shield to evade detection following Charlie Kirk's very public murder.
Swifties are running with an interesting theory online after Taylor kept an extremely low profile at Sunday's game between Travis' Kansas City Chiefs and the Philadelphia Eagles ... her fans think she was behind a bulletproof barrier that was seen rolling through the bowels of Arrowhead Stadium in K.