The singer shared a video of his 8-year-old playing his song "I'll Never Not Love You" on the piano to Instagram July 28.
"Noah surprised me after I was away on tour," Michael wrote alongside the footage. "He worked so hard to learn this song. So proud of my guy."
As the four-time Grammy winner sang along, he admitted he was "getting choked up" as tears brimmed in his eyes.
"More talent in his little fingers than I have in my whole body!!" he captioned the clip. "#ChickenLegs #Proud #IllNeverNotLoveYou."
This isn't the first time fans have been awed by Noah's talent. After all, he co-wrote the title track on Michael's recent album Higher.
"I was giving the kids a shower and doing the shampoo and stuff," Michael recalled on a March episode of The Kelly Clarkson Show, "and he said, 'Papi, I wrote a song.'"
Michael, who also worked with Ryan Tedder and Greg Wells on the track, told Kelly Clarkson the album came after a "rough decade," noting his family has "been through a lot," like Noah's battle with cancer.
"My wife, honestly, when this all started, I became the strength to somehow pull us and lift us and to be positive," he said on "Carpool Karaoke" in 2018, a year after Noah went into remission. "And when they got it out and the chemo was done and they said, 'We did it, it's good, he's ok,' I fell. I just fell. And my wife picks me up now."
"It's the greatest thing that ever happened to me," Michael recently said about becoming a father. "And I don't want to be all gooey about it, but it goes so fast. I mean, my 8-year-old he's growing into a little dude. So, I just need more."