Britney Spears was extremely agitated after getting slapped by a security guard protecting NBA phenom Victor Wembanyama ... according to an eyewitness and photos obtained by TMZ.
TMZ broke the story ... Britney was outside Catch restaurant at the Aria Hotel Wednesday night when she saw Victor and made her way to him for a selfie. She says she tapped him on the back -- he says she grabbed him -- and Victor's security guy backhanded her across the face. Metro police are now conducting a criminal battery investigation.
