The mum-of-five documented the 16-year-old's musical ability on Instagram as he played Beethoven's Fur Elise.
The teenager – who suffers from multiple disabilities including blindness, Prader-Willi syndrome and ADHD – was championed by his 126,000 followers as he delivered an almost faultless rendition of the song.
One fan wrote: "This is amazing you are so super talented x."
Another commented: "Harv is amazing wow Katie please don’t be afraid to encourage this art if he can master that he can definitely master more !?"
A third supported: "You got skills Harvey lad ?."
Katie may be hoping to prove her doubters wrong after her decision to give Harvey an Instagram account came under fire.
Some claimed the former glamour model was setting her son up to be trolled with her choice of posts.
After posting a picture of the disabled teen wearing comedy glasses and sat next to a smashed iPad, one of Harvey's followers slammed: "Shocking how much his mum tries to make him look like a fool for social media attention."
Another added: "This is unfair to Harvey Katie must know he’s going to get hate."
The post came days after she shared a heartbreaking image created by trolls of his face mocked up on a jihadi bride.
The star is currently trying to create Harvey's Law on behalf of her son, with MPs set to discuss the issue of making online bullying a crime in the coming weeks.
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