EXCLUSIVE: John Stamos Says He's Found 'Authentic Happiness' Post Rehab

This is shaping up to be John Stamos' year!

ET caught up with the Grandfathered star backstage at the People's Choice Awards 2016 after he won for Favorite Actor in a New TV Series, and he couldn't help but be grateful for this time in his life.

In July, the 52-year-old actor checked into rehab for substance abuse and since undergoing treatment, he says he's never been better. "It's great. I'm clear, I'm happy, I'm even," he told ET's Cameron Mathison. "You know, during times like this, it's authentic happiness. It's earned, and it feels great."

WATCH: Candace Cameron Bure Reacts to John Stamos in Rehab -- 'It Was a Surprise'

Stamos says he's thrilled just to be living in the moment. "You put yourself in the middle of everything all day, 100% now, because you're clear and you're focused," he explained. "At the end of the day, you can go to bed and go, 'I was there all day for all of it' -- and that's a good thing."

In addition to his big win at the PCAs, Stamos is also looking forward to the premiere of Fuller House on Netflix next month. "We initially wanted to do something different with it but we all said, 'No, let's just do what we do,'" he said of the revamped series. "We have the same creators, same directors, same cast, same set. It's very sweet."

WATCH: John Stamos Is Out of Rehab and Looking Incredible --'I'm Back!'

The TV heartthrob also revealed what fans can expect from Carly Rae Jepsen's new version of the show's iconic theme song. Here's more of his red carpet interview with ET:

John Stamos Says 'Fuller House' Reboot is 'Sweet' But New Theme Song Has 'More Edge'

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2016 People's Choice Awards Red Carpet Arrivals