Kevin Systrom -- who co-founded Instagram and then sold it to Facebook for $1 billion -- isn't just a tech-genius, he also moonlights as a DJ ... and we have pics to prove it.
Systrom was in Las Vegas last night, partying his face off with about 30 of his new FBook buddies -- when he started DJ'ing a set at Rain Nightclub in the Palms Hotel.
This isn't Systrom's first go at spinning records -- he reportedly moonlit as a DJ back in his Stanford days.
FUN FACT: "Entourage" star Adrian Grenier was there too ... which answers the question, "What's that guy been up to?"
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