Here's something that almost NEVER happens to Taylor Swift ... walking anywhere, much less into an NFL game, with zero fanfare -- but we've learned that's exactly what she pulled off on Sunday.
This shot shows Taylor -- rocking the Chiefs' windbreaker -- walking into Arrowhead Stadium to see Travis Kelce and his team play the Chicago Bears. The woman in the black leather jacket is part of Travis' PR team, and she escorted Taylor and Trav's friends to his luxury suite.
The amazing part is .