Trending on BillboardNearly four years after the death of Aaron Carter, Hilary Duff found a way to bring a piece of their shared childhood back into the limelight. During her Lucky Me Tour stop in Philadelphia on Sunday night, Duff wore a vintage white T-shirt featuring a young Carter, whose image appeared alongside his name on the front of the tee. He also made a memorable appearance on Duff’s Lizzie McGuire in 2001. More than two decades later, Duff’s Philadelphia tribute was a reminder of just how important Carter was to that period of her life and her career. The psychic eventually identified that Duff and Carter, whom Duff described as her “childhood boyfriend,” were connected.