Zachary Quinto has a lot to celebrate this weekend.

The “Star Trek” actor is marking 4 years sober.

“Four years sober sun-kissed selfie. grateful for today!” Quinto captioned a shirtless selfie on Instagram.

RELATED: Zachary Quinto’s Charlie Manx Is Back From The Grave And Out For Vengeance In New Season Of ‘NOS4A2’

View this post on Instagram

four years sober sun-kissed selfie. grateful for today!

A post shared by Zachary Quinto (@zacharyquinto) on

And unsurprisingly, the congratulations started to roll in.

“Proud of you, dude,” Zachary Levi commented. “She bangs! Congrats ❤️❤️,” Justin Mikita said.

RELATED: Zachary Quinto Transforms Into Vampire Charlie Manx In ‘NOS4A2’ Timelapse Video

Matt Bomer added, “👏 Proud of you Zach!!❤️❤️.”

Last year, right after celebrating three years sober, Quinto spoke to “The Today Show” about his journey and wanting to help others now.

“I was really proud of that [sobriety] accomplishment for myself and to share my experience and to encourage other people who are interested in that journey for themselves is something that I have a real privilege to be able to do,” he said. “I felt like it was a moment where I wanted to take that opportunity and just acknowledge that my experience of life is entirely different now than it was three years ago, and I couldn’t be more grateful and happier for that. Huge gratitude.”