Cole Tucker made his first Big League start of the 2023 season on Wednesday and Vanessa Hudgens was there for every second of it ... fangirling out over every pitch her future hubby saw at the dish!!!
Tucker -- who the Rockies called up from the minor leagues on Monday -- made the start for Colorado in the outfield during their game against the Brewers in Milwaukee ... and Hudgens had some sweet seats for it.
The "High School Musical" star was right near the plate .