During Usher's performance at Belvedere's Red launch party last week at Avalon in Los Angeles, actor Jamie Foxx got into a fist fight.

X17online has now obtained exclusive video of the brawl ... with Mr. Foxx being lifted off the floor at one point by security while Usher's music plays in the background. The incident took place very close to the stage.

We're told no one was injured during the incident. No charges have been filed.