Hilary Duff found a touching way to honor her late ex-boyfriend Aaron Carter while performing in Philadelphia, Pennsylvania on Sunday.The former Disney Channel darling, 38, wore a vintage Aaron Carter T-shirt to remember him by, according to fan footage.The two started dating at the end of 2000 when they were both 13 after Duff was invited to Carter’s birthday party. They continued to see each other on and off until June 2003.Carter accidentally drowned in the bathtub of his Lancaster, California home in 2022 at the age of 34, after inhaling difluoroethane and taking alprazolam (Xanax).Concertgoers quickly shared Duff’s sweet tribute on social media. The Daily Mail reached out to the singer’s rep but did not immediately hear back. Hilary Duff paid touching tribute to her former boyfriend Aaron Carter during her concert in Philadelphia on Sunday night. She’s pictured in Las Vegas in May The former Disney Channel darling and the late child star started dating at the end of 2000 when they were both 13. They continued to see each other on and off until June 2003Carter, who left behind a $500,000 estate, is survived by his four-year-old son Princeton ‘Prince’ Lyric Carter and his former fiancée Melanie Martin who is suing his dentist Jason Mirabile for wrongful death.Tragically, the I Want Candy singer was predeceased by his sister Leslie in 2012 and his sister Bobbie Jean died in 2023. Both succumbed to drug overdoses.’I’m friends with Aaron Carter’s sister still, Angel,’ Duff revealed to Las Culturistas podcast on April 1.’Our kids go to the same school. She’s a lovely literal angel of a person. We’re very close. We talk about Aaron often.’ She also claims to have ‘connected’ with Carter during a phone session with a psychic, who didn’t know her identity.’She’s like, “Well, people are going to start showing up for you. And there’s someone here, Aaron. A two A’s, Aaron,”‘ Duff recalled. Carter accidentally drowned in the bathtub of his Lancaster, California home in 2022 at the age of 34, after inhaling difluoroethane and taking alprazolam (Xanax). ‘I’m friends with Aaron Carter’s sister still, Angel,’ Duff revealed to Las Culturistas podcast on April 1. ‘Our kids go to the same school…. We talk about Aaron often”My heart! I was like, “Oh my god.” And I was like, “Is it Aaron Carter?” And she’s like, “Sure is! What the hell is he doing here?” And I was like, “Well, that’s my childhood boyfriend. And you know, that would make sense to me.And she’s like, “Are you Hilary Duff?” And she was like, “[Your song] So Yesterday helped me through my breakup and I will never not love you.” And I was like, “Oh my god, so funny! Thank you so much.” Anyway, yeah, a really wild experience.’Following his shocking passing, the SI Swimsuit cover girl previously paid tribute to Carter.’For Aaron, I’m deeply sorry that life was so hard for you and that you had to struggle in front of the whole world,’ Duff, who boasts 44.5 million social media followers, wrote on Instagram.’You had a charm that was absolutely effervescent… Boy, did my teenage self love you deeply. Sending love to your family at this time. Rest easy.’ The I Want Candy singer – who left a $500,000 estate behind – is survived by his four-year-old son Princeton ‘Prince’ Lyric Carter and his former fiancée Melanie Martin is suing his dentist Jason Mirabile for wrongful death (pictured August 1) Duff is next scheduled to bring her 57-date Lucky Me Tour to Canada for sold-out concerts at the RBC Amphitheatre in Toronto, Ontario this Wednesday and Thursday (pictured June 21) Duff has welcomed three daughters, Banks, seven, Mae, five, and Townes, two, with her second husband Matthew Koma. The homeschooled millennial is also mother to 14-year-old son Luca Comrie from her three-year marriage to ex-husband Mike Comrie, which ended in 2014 (divorce finalized in 2016).Duff was still married to the 45-year-old retired NHL centre when she originally met the 39-year-old music producer in 2013 while collaborating on her fifth studio album – Breathe In. Breathe Out.The married couple of six years began dating in 2017, and he oversaw the recording of her sixth studio album, Luck… or Something.Duff is next scheduled to bring her 57-date Lucky Me Tour to Canada for sold-out concerts at the RBC Amphitheatre in Toronto, Ontario, this Wednesday and Thursday.It marks the Growing Up singer’s first world tour in nearly 20 years.Duff’s opening acts are all led by women – English synth-pop act La Roux as well as Canadian crooners Lauren Spencer Smith and Jade LeMac.The Weather for Tennis songstress is also every bit the influencer with paid partnerships for brands like Aperol Spritz, Bath & Body Works, Ladder and Montage Laguna Beach.Duff, who pulls 3.1 million monthly listeners on Spotify, originally got her start playing the titular role in the Disney Channel comedy series Lizzie McGuire (2001-2004) and the 2003 big-screen spin-off.