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Luann de Lesseps and her estranged husband, Tom D’Agostino Jr., were out and about in the Hamptons this weekend — just not with each other.

The countess, as she is known to fans of “The Real Housewives of NYC,” was at Le Bilboquet in Sag Harbor, where she met up with her ex-boyfriend Jacques Azoulay.

“They seemed very cozy,” one source said. “It really does look like Luann and Jacques are back together.”

But a Luann source told me, “She was there with girlfriends and Jacques stopped by their table to say hello. They are friends. He came to her wedding.”

Meanwhile, D’Agostino was at a house party in East Hampton thrown by Harry Dubin and his girlfriend Pamela Mitchell.

The crowd also included Michael J. Fox and wife Tracy Pollan, Laurie Durning (the former Mrs. Roger Waters) and Missy Tool, an ex-girlfriend of D’Agostino who supposedly helped hasten the end of his seven-month marriage to Luann.

“Tom didn’t come with [Missy], or leave with her. They aren’t dating,” said a D’Agostino pal.

D’Agostino wouldn’t tell me if it was true that when he learned that Luann had thrilled a party crowd by belting out “Hit the Road Jack,” his response was the title of one of Luann’s songs, “Money Can’t Buy You Class.” He just smiled.