An eyewitness to the Britney Spears slap at the hands of security for NBA phenom Victor Wembanyama tells TMZ ... he clearly struck her and she was furious.
Brian Grajales, a Canadian who was outside Catch restaurant Wednesday night says he saw Britney approach Victor's entourage, clearly wanting to take a photo with him.
I WITNESSED THE SLAP
Brian says she "infiltrated" her way into his circle, leaned in, and in a British accent, said, "Excuse me, sir .