*An all-out beatdown was administered Monday night to a man who tried to crash the VIP area of a birthday party for rapper Juelz Santana. [Watch clip below.]

The incident at New York’s M2 Ultralounge jumped off when a man wearing a Rev Run hat attempted to hop over the VIP divider.

After a failed attempt to defuse the situation, several men began punching the intruder until he was on the ground. Somehow, the man emerged from the chaos and was able to leave the club.

Santana reportedly stood by and watched. Rapper Maino was spotted in the melee, but is never actually seen throwing a punch.

Snoop Dogg, Lil’ Kim, and Ashanti were also at the party during the mayhem … but stayed out of it, TMZ reported.