Christina Milian violent bodyguard showdown [VIDEO]: songstress' security smacks aggressive, bra-flashing fan outside Hollywood nightclub [WATCH]

Christina Milian just wanted to have a good time at Hollywood's popular Hooray Henry's nightclub on Sunday evening (March 29) - but one aggressive partier got a little too out-of-control. And the songstress' bodyguard felt he had to react with a slap.

According to TMZ, an unknown female "wearing only a bra and shorts" apparently attacked Milian's security guy - and he wasn't having that:

First, a TMZ reporter chats Milian up, asking which song makes her want to get "down and dirty" on the dance floor (her response - Beyonce's "Watermelon," of course). After this convo takes place (while the songstress is leaving the club), a belligerent woman approaches Milian's bodyguard in a rather bizarre fashion. So he immediately responds with an open-handed slap to the face.

Still no details about the "victim" - but the video footage is pretty wild.

Milian and her crew hastily left shortly after the odd confrontation. Surly this video will go viral soon.