Floyd Mayweather might've been throwing jabs this weekend, but Joseline Hernandez was handing out haymakers backstage ... landing several on Big Lex.
The former "Love & Hip Hop" star -- dressed in light blue -- was on hand Sunday during FM's exhibition fight against John Gotti III in South Florida ... as were a ton of other Zeus Network-connected reality stars, like Big Lex for example.
Lex -- once featured on Joseline's own reality show, "Joseline's Cabaret" -- was on the receiving end of a brutal beatdown during the boxing match.