Britney Spears might be doing it again ... as in going out with a guy with whom she's been working.
Britney was seen grabbing sushi Saturday night with her co-star from her newest music video, "Slumber Party" ... and this pic of them together is ... interesting.
The stud, Sam Asghari, starred alongside Britney as her love interest. He's a personal trainer -- and he might be attached judging by how fast he took down the post.
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