Jackson Mahomes was partying his face off to kick off the weekend ... and he had the best seat in the house to watch a DJ do his thing.
Patrick Mahomes' little brother was front and center Friday night at Mosaic Ultra Lounge in Kansas City, MO -- where James Kennedy was handling music for all the club-goers ... and putting on a pretty good set, if Jackson's reaction here is any indication.
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Check it out ... in footage obtained by TMZ, you can see the 23-year-old influencer raging as Kennedy spins his records, and even got on his feet at one point and cheered JK on.