Talk about a reality check!

Polo Bar was crawling with A-listers Sunday night after a New York Film Festival screening of a new documentary on Martin Scorsese. But a “Real Housewives” star stole the show — at least for one diner.

A spy said that Jodie Foster, Robert De Niro, Peter Dinklage, “White Lotus” star Michael Imperioli and E Street Band rocker “Little” Steven Van Zandt were all spotted celebrating the “Raging Bull” director, 82, after the screening of the docuseries “Mr. Scorsese.”

But a spy at the starry eatery told Page Six that with all the film and TV legends in the room, “The funniest moment of the evening” was when a regular patron who was “seated across from her boyfriend” could be overheard exclaiming to her beau: “Holy s - - t! I didn’t think I could be even more exci

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