Pete Davidson startled locals on Orchard Street by brawling with a pack of vagrants, but bystanders quickly realized there were cameras rolling.

Davidson and his pal Callum Turner were filming a scene for their new movie, “One Night Only.” The “SNL” veteran has a cameo in the rom-com, playing an undercover cop who helps Turner’s character break up the fight.

Turner then moved north where his movie crew took over several shops , including a Ray’s Pizza on Columbus Ave. and 82nd St., which was rechristened Claremont Pizza for the film. Turner’s character owns the pizzeria.

The hunky English actor, who in real life is engaged to singer Dua Lipa , set local hearts aflutter as he was filmed delivering pizza and buying flowers for his onscreen love at nearby Q Florist.

The

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