Britney Spears Slapped by NBA's Victor Wembanyama Security ...

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10:02 AM PT -- We've now gotten photos showing Britney Spears and Victor Wembanyama headed toward the restaurant's entrance.

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You can see Spears come up from behind the young NBA star -- and from there, a witness said she tried to tap him on the shoulder, which led to things getting physical with security.

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9:46 AM PT -- We just received contrary information about the police investigation from a source high up in the Metro PD. Our source says this is indeed a criminal investigation and they are taking the incident "as serious as a heart attack." The source adds the case will "likely" be referred to the D.A., although that does not mean criminal charges will be filed.

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9:10 AM PT -- We're told Vegas police brass will be meeting face-to-face with Britney this morning to discuss the incident. We got video of them walking through the lobby to go up to her suite.

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Our law enforcement sources tell us the cops who responded to ARIA reviewed security camera footage showing Smith push Britney's hand away ... and then her hand, not Smith's, struck her face. Cops did not address the velocity of the force of the swing.

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8:23 AM PT -- Law enforcement sources tell TMZ, the man listed on the police report as the one who slapped Britney is Damian Smith, the Director of Team Security for the Spurs. Our sources say it is not being handled as a criminal matter, because cops determined Smith was not trying to hurt Britney but rather defend Victor Wembanyama.

Britney Spears was allegedly assaulted Wednesday night in Vegas, after a member of NBA phenom Victor Wembanyama's security backhanded her in the face, and she has filed a police report.

The incident went down at Catch restaurant in the ARIA Hotel around 8:30 PM. Britney, along with her husband, Sam Asghari, and 2 others went to the restaurant for dinner. She was swarmed by fans as she entered the casino.

Britney and co. walked over to Catch, and as they were entering the restaurant, Britney spotted Victor. We're told she's a fan and went over to him to ask if they could take a photo together. She tapped him on his back, right shoulder and, we're told the Director of Team Security for the San Antonio Spurs -- the team that drafted Victor last month -- instantly backhanded her, causing her to fall to the ground ... knocking her glasses off.

Britney composed herself and went to her table. We're told the security guy came over to the table and apologized. He said, "You understand how it is when you're being swarmed by fans." He apologized and Britney accepted it. BTW, we're told he also said when he slapped her he didn't know who she was.

Britney's security team spent time with Victor's security guy, and afterward her team filed a police report with the Metropolitan Police Dept. alleging battery.

Originally Published -- 7:35 AM PT