Aaron's fiancée Melanie Martin shared a statement with TMZ confirming the singer's death, saying: "I love Aaron with all my heart and it’s going to be a journey to raise a son without a father.
"Please respect the privacy of my family as we come to terms with the loss of someone we love greatly. We are still in the process of accepting this unfortunate reality. Your thoughts and prayers are greatly appreciated."
Aaron hit stardom back in the 1990s, releasing his debut album at just nine years old. He went on to transition into rap and also appeared on Dancing With The Stars and a Broadway production of Seussical.
The celebrity struggled with legal issues and substance abuse.
The pop-singer-turned-rapper also once toured with his older brother Nick's band the Backstreet Boys.
Following the tragic news, Nick shared a tribute to the I Want Candy singer, saying that while he and Aaron had a "complicated relationship", their love "never ever faded".
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His former girlfriend Hilary Duff shared a heartfelt statement on Instagram, penning: "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.
"You had a charm that was absolutely effervescent... boy did my teenage self love you deeply.
"Sending love to your family a this time. Rest easy."
Lindsay Lohan, who dated Aaron around the same as Hilary, also paid tribute to the late performer while speaking to Entertainment Tonight.
"My heart goes out to his family and may he rest in peace... God bless him," she said, adding that there was once a "lot of love" between them.
The Mean Girls star also told Access Hollywood that while it has been a "long time" since she and Aaron last spoke, they shared a lot of memories when they were "so young".
Socialite Paris Hilton also shared a statement to Twitter: "He was always kind to my family and I. He had a good heart. Gone way too soon. Sending my thoughts and condolences to his loved ones and family. RIP."
Boy bands *NSYNC and New Kids on the Block also marked the sad death, both groups sending their support to the singer's family and friends in respective statements.
If you or someone you know has been affected by any of the issues raised in this article, help is always available. Call Lifeline on 13 11 14 or visit their website.