As we first reported, Jamie got into a scuffle at the Belvedere Red party at Avalon last night. According to an eyewitness who was in the thick of things, Foxx and the other guy were in a long conversation -- and a pretty intense handshake -- when the guy suddenly pulled Jamie down and put him in a headlock.
We're told it took security about 20 seconds to pull the guy off Jamie and then drag him out.
No cops were called and there were no injuries.
UPDATE: We just got our hands on video of the fight taken from a balcony above.