The 'I Want Candy' hitmaker went down to 115 pounds, the exact amount the late King of Pop was when he died in June 2009 from acute Propofol intoxication at the age of just 50.
The 29-year-old singer says it was a number of issues that lead him to become so underweight, but insists he's determined he'll never end up like his 'Thriller' star friend.
He admitted to Us Weekly magazine: ''There were times when I would get scared. You know what I mean? I would stress out because of all the stuff going on inside of me, and then I'd lose all this weight, and then I get in a bad relationship. Then that sh*t would stress me out, and then I would be emaciated - 115 pounds. I couldn't believe it.
''Michael died at 115 pounds. It was heartbreaking.
''I love Michael, but that's not going to be me. Look at me. Look at my transformation, in months ... My health is very important. Health is very important for everybody, and I was so scared.''
Aaron entered a rehabilitation centre earlier this year, where he completed two months of treatment aimed at improving his ''overall health'' after becoming ''super malnourished''.
Thanks to the help of Alo House in Malibu, California, he was able to put on 45lbs in under 50 days, by eating right and sorting through other long-standing mental health problems.
He revealed previously: ''Well, I struggled from an eating disorder, so I had seven ulcers. I was, like, 115 pounds, super malnourished.
''It was tough, you know, it was tough a bit on myself, but the Alo House where I went was incredible. They helped figure it out for me what was going on with me, and there are other things going on, like, I suffer from PTSD. I have a lot of trauma from my past and a lot of loss, so that's something I have to deal with on a daily basis.
''I did detox and through that detox, I gained, like, two pounds every day. Twenty-eight percent of body weight I gained. ... I took a break, and figured out what was going on in my mind, and the things that were really festering up and bothering me. I'm still figuring those things out.''
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