Taylor Swift didn't stay in hiding for long! After the Kansas City Chiefs' disappointing loss on Sunday, the pop star joined her boyfriend, Travis Kelce, at his pal Patrick Mahomes' 30th birthday party! Right after the game, the friends gathered at the football stars' new steakhouse, 1587 Prime. Related: Fox Sports SLAMMED For 'Embarrassing' Taylor & Travis Wedding Parody! In a cute photo posted to Instagram after the bash, country star Kane Brown shared a snap of him and his wife, Katelyn Brown, with Pat, his wife, Brittany Mahomes, and the newly engaged couple! Celebrating 'em all, he wrote...