(Cover) - EN Showbiz - Members of the Jersey Shore cast were involved in a "massive bar brawl" over the weekend.

Stars including JWoww and her boyfriend Roger Matthews, Pauly D, The Situation, and Ronnie Ortiz-Magro were caught up in the violent fracas at popular Seaside Heights venue Bamboo Bar.

According to an onlooker, the fight escalated quickly.

"It started as a small fight, then turned into a massive brawl," the insider told US Weekly. "Jenni's boyfriend beat up a few guys, Pauly knocked some guy out, [and] Ronnie [and] Sitch were all there as well, fighting off guys. Jenni sprained her ankle. It was rough."

The reality TV stars have started filming for the sixth season of the hit MTV show. A witness says the cameras instigated the confrontation.

"These drunk guys saw the cameras and started taunting the girls. Then, they started bothering Ronnie, Vinny, The Sitch, and Pauly," the source added.

"They came back and got in their faces.Roger and Ryan [Labbe, from MTV's The Pauly D Project] stepped up and all hell broke loose. It became a club-wide brawl . . . Ronnie, Sitch, Ryan, Rodger and Pauly were fighting five guys, and bouncers too . . . Jenni was fighting with the guys."

Cast member Vinny Guadagnino was also present when the fight broke, however he remained neutral.

"He was [hanging] with the girls," the source shared. "He's a lover, not a fighter."

Pregnant star Snooki was not present at the time of the struggle. (C) Cover Media