On Aug. 9, the singer paid tribute to the late Aaron Carter, her teenage ex-boyfriend, with a subtle but sweet gesture during the Philadelphia stop on her whirlwind Lucky Me Tour. Duff dated Carter on-and-off for three years in the early 2000s, when they were teenagers, after he guest-starred on her breakout Disney Channel series Lizzie McGuire. “You had a charm that was absolutely effervescent… boy did my teenage self love you deeply.” E Charbonneau/Bei/ShutterstockNonetheless, Duff says their connection was so deep that Carter once visited her through a psychic during a phone call. “I was like, ‘Is it Aaron Carter?’