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Peter Brant Jr., son of the billionaire Peter M. Brant and super­model Stephanie Seymour, was arrested Wednesday evening for allegedly creating a drunken ruckus and roughing up a Port Authority cop at Kennedy Airport.

Brant Jr., a 22-year-old model, was waiting in the JetBlue terminal to board a flight for West Palm Beach, Fla., when he became disorderly, said PA spokesman Joe Pentangelo.

A source said Peter was acting “drunk and belligerent,” which allegedly led to a fight with a JetBlue staffer.

PA cops were summoned, but he refused to follow their instructions to sit down and lower his voice, and ended up assaulting one of them, the source said.

He was taken to Jamaica Hospital to be treated for severe intoxication, police said, and will also undergo a psych evaluation.

Society child Peter was recently spotted cavorting with Princess Maria-Olympia of Greece in Soho.

Brant’s father, Peter Brant Sr., is a billionaire industrialist and childhood friend of Donald Trump. The elder Brant was waiting for his son in West Palm Beach Wednesday night.

Peter’s past run-ins with the law include a 2014 incident when he was ticketed for possession of marijuana while visiting Red Hook, Brooklyn, cops said.

In 2011, Seymour, Peter’s mother and a former Victoria’s Secret model, called the cops after an apparent domestic incident at their Connecticut home.

Peter Jr. and his brother Harry were dubbed “The New Princes of the City” in a 2012 fashion piece for the New York Times and called “Little Lord Flauntleroys” in a feature piece for Vanity Fair magazine.

The Brant brothers are part of the so-called “Rich Kids of Instagram” who flaunt their jetsetting lifestyle on social media.