The party didn't stop once the AMAs were over -- because Ne-Yo held a celeb crammed, performance bash.

Jamie Foxx, Jenny McCarthy, Mark Salling, Karina Smirnoff, Christina Milian, Tristan Wilds, Brandy, The Situation, Ray-J and more all showed up to the party, hosted by VEVO, at the Avalon last night -- where Kelly Rowland, Diddy and Ne-Yo all hit the stage to perform for the crowd!

Check out all the party pics!

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