By Jarrod Castillo Jason Kelce, the Philadelphia Eagles legend, had a wild time cheering on his younger brother Travis Kelce and the Kansas City Chiefs in their game against the Buffalo Bills. Despite the freezing temperatures at Highmark Stadium, Jason took off his shirt and even jumped into a crowd of Bills fans for some friendly banter. In an unexpected move, Jason, still without his shirt, posed for a photo with a young fan and introduced her to Taylor Swift. He then returned to join Swift and the rest of the group supporting Travis and the Chiefs. READ MORE: Full list of NFL Playoffs on D…