EXCLUSIVETwo hot, young chicks strapped on boxing gloves ... in bikinis ... and went at it INSIDE a Miami nightclub to celebrate Andre Berto's 31st bday ... and TMZ Sports has the footage.
The 2-time welterweight champ turnt all way up Mokia Lounge in Miami Beach recently -- alongside big stars like MLB pitcher Aroldis Chapman and fellow boxer Adrien Broner.
The scene was crazy ... huge bottle of champagne, scantily clad women, fancy cake -- and Berto tells TMZ Sports the whole thing was "epic!"
"We partied all night! That s**t was nuts!"