Taylor Swift was in the holiday spirit earlier in December when she joined Brittany Mahomes and other Kansas City Chiefs WAGs at a team Christmas party. Ana Demmer, girlfriend of Chiefs offensive lineman Creed Humphrey, shared a montage of moments from her past month via Instagram, and eagle-eyed viewers caught a glimpse of Swift, 36, at the party The photo showed Swift in the back row of a group shot of all women, craning her head so it was just visible over a gigantic fake Snoopy in the foreground.