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DaBaby brutally assaulted a fan Saturday night as he made his way to the stage, and the crowd was so enraged at him the show ended before it began.

The rapper was at Whiskey North in Tampa for his "Up Close N Personal" tour when a woman waved her phone in his direction, presumably to get a pic. Check out the video ... you see DaBaby unload on her.

DaBaby slaps a woman as he’s walking through a crowd of people. pic.twitter.com/bx6Ds717iu — THE NEIGHBORHOOD TALK (@TNHTalk) March 8, 2020 @TNHTalk

Folks at the concert tell TMZ ... after the initial shock subsided, the crowd started booing the rapper. DaBaby and his crew left without performing a single song. Check out the strike from a different angle too, BTW. It's a straight up open palm slap across the face.

You can hear people shriek in horror as DB calmly walks away, and the crowd around the woman bend over to help her. Eerily to similar to another incident DaBaby's bodyguard was involved in back in September ... when the guy KO'd a girl, whom he thought was a guy.

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Now, DaBaby has spoken on this. He went on his Instagram story to share a video of the incident, saying, "who know shawty government name so my lawyer can get active."

Cops showed up -- responding to a 911 assault call -- but no arrests were made.

DaBaby's had his share of problems recently. He was recently accused of beating up and robbing a guy in Miami. The battery charges were dropped but he's still under the microscope for robbery -- he allegedly jacked the guy's cellphone, credit card and cash.