are back in —and this time they packed formal wear.On April 27, the power couple joined in Vegas for The 15 and Mahomies Foundation Golf Classic gala and auction event. In one video recorded by an attendee, Kelce could be seen leading Swift by the hand in a classic suit, though he left his tie at home and kept his white dress shirt unbuttoned at the neck.For her part, Swift was dressed in a floor-length emerald dress with a chainlink necklace, letting her blonde hair down in loose waves.