Zayn Malik on stage in Washington D.C. back in JanuaryZayn Malik surprised fans at his show on Tuesday night with an impromptu throwback to his One Direction days – on the anniversary of his exit from the band being announced.The chart-topping singer is currently nearing the end of his first ever solo world tour, but kicked things off in a different way at his show in Mexico City.Much to fans’ delight, Zayn opened the set with a live performance of Night Changes, which also happened to be the last single One Direction released with him still a part of the group.Zayn with his One Direction bandmates Liam Payne, Lou