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 Ventura, CA ... where he thanked everyone who helped him stay on the straight and narrow and performed some of his stand-up comedy routines.