BAD GIRLS BLOODBATH!!! NATALIE NUNN CUTS BAD GIRL CLUB MEMBER FLO IN THE FACE . . . WITH A FOREIGN OBJECT!!! (FLO WAS LEAKIN' LIKE A FAUCET)

Some CRAZINESS happened last night in Atlantic City, NJ.

Former Bad Girls Club star Tanisha Thomas was having her BACHELORETTE PARTY - and she invited a group of her BAD GIRLS CLUB former castmates - including Natalie Nunn and Flo. Natalie Nunn and Flo have been having a WAR OF WORDS over Twitter for the last year or so - ever since Flo BEAT UP NATALIE on the Bad Girls Club reunion show - see below:

Well last night, Natalie got her REVENGE. According to a witness Natalie and Flo got into a heated FIGHT. During the fight, Natalie BRUTALLY BEAT Flo - first with her FISTS. Then she reportedly pulled out a FOREIGN OBJECT and used it on FLO.

Our insider claims that after the beating Flo was "leaking everywhere" and that she had to be taken by STRETCHER to the hospital.

No word yet on whether POLICE are involved, or what Flo's condition is. But we can tell you that the OXYGEN cameras got MOST OF IT on video tape!!!