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Luann de Lesseps’ soon-to-be ex-husband, Tom D’Agostino Jr., “is officially on the prowl,” a spy told Page Six, after he and de Lesseps filed for divorce after only seven months of marriage.

D’Agostino was spotted at Le Bilboquet in Sag Harbor on Friday, where a spy said, “He was making a move on romance novel cover queen . . . Cindy Guyer.”

Guyer, who is known as the female Fabio, has been a model for thousands of bodice-rippers, and earlier in her career was a model for the “Nancy Drew” teen series. She’s also been on Bravo’s “Millionaire Matchmaker” and owns Guyer’s bar on the Upper West Side.

“Tom went straight up to the blond bombshell, despite the fact she was with a group of friends,” said our spy. “After about two hours of flirting,” his moves seemed to backfire as “the two left separately.”

The spy said: “It looks like he’s embracing the single life again, quite easily.” Since his split with “Real Housewife” Luann, entrepreneur D’Agostino has been spotted with a string of women, including his ex-girlfriend Missy Tool, according to reports.

He was also photographed over Labor Day weekend squiring around another mystery blond woman in the Hamptons in a BMW.