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Cops are investigating after Luann de Lesseps’ ex-husband Tom D’Agostino got into a confrontation in a Palm Beach, Fla., restaurant, Page Six has learned.

We’re told that D’Agostino and a new girlfriend dropped by Cucina Dell’Arte last weekend, but that things went awry after he ran into an old business rival.

Sources say the other man — who we’re told has a long-running business beef with D’Agostino — approached D’Agostino’s gal pal, and D’Agostino intervened. We’re told that both men hurled drinks at each other (in textbook “Real Housewives Of New York” star form) and then D’Agostino left.

A Palm Beach police source told us there were no arrests but that an investigation is underway.

It’s a pity that D’Agostino and de Lesseps couldn’t make their marriage work, since they seem to share an interest in boozy bust-ups in Palm Beach. De Lesseps was arrested just over a mile away at the Colony Hotel before Christmas for battery on a law enforcement officer after she allegedly shoved a cop who tried to make her leave a hotel room that wasn’t hers.

As Page Six first reported, de Lesseps and D’Agostino split last August after a turbulent seven-month marriage.

A rep for D’Agostino declined to comment.