Justin Bieber brought the house down at 1OAK in WeHo Saturday night with a mini-concert.
Bieber took the stage and sang, among other things, "What Do You Mean?," and then rapped with Tyga.
It's interesting ... even Bieber seems a little surprised at his popularity among adults, asking "How many people thought you would like Justin Bieber?"
He's referring to himself in third person, so he's not that humble!
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