Rapper Juvenile was arrested for disorderly conduct at a Miami hotel last night after allegedly participating in a crazy brawl … TMZ has learned.

Juvenile — real name Terius Gray — had just reunited with Lil Wayne on stage at LIV nightclub earlier in the evening … when something went wrong.

While the fight was not with Lil Wayne, Juve who was in the Hot Boys together with Wayne back in the late ’90s — had a long running beef with him when the group broke up … and last night was the first time they have been on stage together since the feud.

But around 7AM, cops say Juvenile — who’s listed at 5’11, 150 lbs — was involved in a fight that began inside the nightclub and spilled outside to the front of the hotel.

Security told police the people involved in the fight were “creating a threat to life and property as well as the overall safety of the patrons inside.”

Miami Beach PD responded to the scene and arrested Juve — he was hauled to a nearby station where he was booked. He is still in custody.

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