Kansas City Chiefs tight end Travis Kelce is used to going viral for his play during the football season but he did it once again last month when he made a surprise cameo on stage at the Eras Tour in London. The 34-year-old NFL player joined his girlfriend Taylor Swift as she did an on-stage costume change before singing ‘I Can Do It with a Broken Heart’ from her new album, The Tortured Poets Department. Swift’s fans had grown used to seeing Kelce in the VIP sections of her shows, dancing along and sending her signals from off the stage, but his surprise appearance in London was his first time…