Floyd Mayweather Fighting John Gotti's Grandson, Ozuna Performing

Floyd Mayweather's next fight isn't just going to be a boxing match, it's also going to be a big music event, too ... 'cause TBE will be squaring up against John Gotti's grandson, John Gotti III -- and music superstar Ozuna will be performing!!

TMZ Sports is told the bash will go down on June 11 in Sunrise, Florida ... and Floyd (50-0, 27 KOs) is expected to make the exhibition bout official at a press conference on Thursday.

We're told Ozuna -- whose songs have billions of views on the internet -- will be taking the stage for a special set during the extravaganza ... making it an entertaining night in both sports AND music.

Gotti III -- a mixed martial arts fighter (5-1-0) -- is 2-0 (1 KO) as a professional boxer ... and the fight is being promoted as a "Last Names Matter" spectacle ... which makes sense, considering his grandpa is one of the most infamous crime bosses ever.

"Floyd was the first to start the exhibition concept, and everyone followed. Now he is adding some spice to the mix," James McNair, Mayweather’s pal, and president of the Money Team, told TMZ Sports.

"A boxing exhibition and musical performances all under one roof."