Shaun Weiss is celebrating another milestone in his amazing turnaround ... and the 'Mighty Ducks' star is marking the occasion with some other kid actors from back in the day.
Shaun reached 4 years sober Thursday, and he was surrounded by a whos who of '90s stars at the Corbin Bowl in Tarzana, CA ... where he thanked everyone who helped him stay on the straight and narrow and performed some of his stand-up comedy routines.
Thomas Ian Nicholasfrom the 'American Pie' franchise and "Rookie of The Year" provided some of the night's entertainment ... singing and playing guitar.
Other '90s celebs supporting Shaun included ... Nate Richert from "Sabrina The Teenage Witch," Natanya Ross from "The Secret World of Amex Mack," Marty Yorkfrom "The Sandlot," plus John Diresta from "Mickey Blue Eyes" and "Miss Congeniality."
The milestone is huge for Shaun ... he seemed to hit rock bottom back in 2020 when he was arrested for burglary and meth, posing for an infamous mug shot. Back then, he used to live on the streets.