Brittany Mahomes celebrated her 30th birthday in coordinating outfits with Taylor Swift. Mahomes, who turned 30 on August 31, took to Instagram on Tuesday, September 2, to share moments from her big day. In one rare photo featuring the pop star, she and Swift, 35, both wore all-black ensembles, pressing their heads together while enjoying a cocktail. Brittany, who is married to the Kansas City Chiefs quarterback Patrick Mahomes, stunned in a black corset top featuring a plunging neckline and relaxed collar. She teamed it with a dazzling diamond choker.