Jersey Shore's cast members apparently participated in crazier activity than just drinking and picking up girls at bars while filming the MTV reality show's sixth season in Seaside Heights, NJ this weekend.

Mike "The Situation" Sorrentino, Paul "Pauly D" DelVecchio, Ronnie Ortiz-Magro, Jenni "JWoww" Farley, and Farley's boyfriend Rodger Matthews were involved in a "massive" bar brawl on Friday night at the Bamboo Bar, a source told Us Weekly.

"It started as a small fight, then turned into a massive brawl," the source said. "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."

Jersey Shore's cameras apparently provoked some of the bar-goers to give the reality TV stars a hard time.

"These drunk guys saw the cameras and started taunting the girls. Then, they started bothering Ronnie, Vinny, The Sitch, and Pauly," the source said, adding the Jersey Shore group attempted to ignore the instigators at first.

"They came back and got in their faces. Rodger and [MTV's The Pauly D Project star Ryan Labbe] 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."

According to a local clubgoer, Ortiz-Magro reportedly got punched in the face after the worst of the brawl was over. Fellow Jersey Shore castmates Vinny Guadagnino and Nicole "Snooki" Polizzi apparently stayed out of the action.

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

Polizzi -- who is six months pregnant with fiance Jionni LaValle's baby and living in a separate house from the rest of her crew while the show's in production -- was reportedly "not present" when the chaos began.