Russell Wilson went from NFL superstar to proud dad real quick this weekend ... 'cause after Future Zahir hit his first ever over-the-fence home run -- the Denver Broncos QB went crazy!!!
The memorable moment went down on the baseball diamond just after one of Ciara's 8-year-old son's games ... when Russ and the boy were getting in some extra work.
You can see in video Wilson shared to Instagram page on Sunday ... the quarterback was throwing Future Zahir some pitches, when the kid got a hold of one.
The ball traveled to deep left field .