City billionaire John Catsimatidis is making his big-screen debut in heartthrob Timothée Chalamet’s newest film, “Marty Supreme” — and, in true form, is making cash off griping about the high cost of things.

“I actually got paid! I’m a member of SAG. And so I got a new career at my age,” t he 76-year-old supermarket mogul told The Post on Friday. 4

“Josh Safdie — who is the big producer on it — he was looking for Upper West Side people and approached me, and I said, ‘Yeah! Sounds like fun!’ ” the mogul said.

Catsimatidis — who is also famous these days for his WABC radio show, where he regularly complains about rising costs in the city — revealed he will star in “two or three scenes” of the new film about the life of a fictional table-tennis star, Marty Mauser.

The inspiration

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