Getty Composite

Taylor Swift and Brittany Mahomes were side-by-side cheering on their men at the Kansas City Chiefs game ... both rocking similar red outfits for the occasion.

TS and BM were spotted in their usual box seats Monday night at Arrowhead Stadium for the Chiefs vs Washington Commanders game ... with the broadcast cutting to the duo shortly after Taylor's fiancé, Travis Kelce, put the Chiefs up 21-7 in the 3rd quarter -- catching a touchdown pass from Patrick Mahomes.

Taylor and Brittany were seen chatting and pointiing toward the field ... with Taylor wearing a sleek red turtleneck and Brittany sporting a similar long-sleeve top.

The Chiefs ended up winning the game without a hitch ... with a final score of 28-7. Gallery Launch Gallery

As you know, Taylor and Brittany

See Full Page