Victor Wembanyama says Britney Spears didn't just tap him on the shoulder before a security guard put his hand on her on Wednesday night ... the NBA star says she full-on "grabbed me from behind" -- sparking the intense scene.
The San Antonio Spurs' top pick explained his side of the situation to KENS 5 reporter Nate Ryan shortly after a workout on Thursday afternoon ... saying it all went down as he was walking into Catch restaurant in the ARIA Hotel in Las Vegas.