AceShowbiz - Hilary Duff mourned the death of her ex-boyfriend, Aaron Carter. Upon learning of the "I Want Candy" singer's passing, the "Lizzie McGuire" star took to social media to pen a heartbreaking tribute to him.

"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," the 35-year-old actress wrote in an Instagram note shared on Saturday, November 5. "You had a charm that was absolutely effervescent ... boy did my teenage self love you deeply."

Aaron passed away at the age of 34 on Saturday. The younger brother of Backstreet Boys' Nick Carter was found dead in his home in California and TMZ reported that his body was discovered in the bathtub.

Confirming Aaron's death was his representatives at Roger Paul Inc. "We are extremely saddened and shocked to confirm the passing of Aaron Carter today. At the moment his cause of death is being investigated. We ask that you give the family time and they will have more information when available. We cannot express the outpouring of love coming in," so read the statement.

As for Hilary and Aaron, they dated on and off for about three years. The actress first dated the singer-turned-rapper for more than a year in 2000 before he overlapped their relationship by romancing Lindsay Lohan.

Aaron, however, admitted that he regretted the breakup. Back in 2014, he declared his love for Hilary on Twitter by saying, "Don't be that stupid douche that loses the love of your life forever.. Like me... I'll spend the rest of my life trying to better myself to get back to her. I don't care what ANY of you think."

Unfortunately, Hilary did not feel the same as she was married to Mike Comrie at that time. "I don't know how I feel. I mean, that was so long ago, and obviously I'm still married, and I have a baby and we kind of just... [We] don't know each other," the musician, who has been married to Matthew Koma since 2019, pointed out.