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Luann de Lesseps soon-to-be-ex-husband returned to the “scene of the crime” this week.

Tom D’Agostino — who split with the “Real Housewives of New York City” star in August after seven months of marriage — was spotted leaving the Regency Hotel on the Upper East Side on Wednesday and getting into a car with two blond women and a man, we’re told.

Fans of the Bravo show will recall that D’Agostino got in trouble last year because of an evening at the Regency with a different blonde.

There was an enormous uproar after Bethenny Frankel revealed that D’Agostino was caught kissing ex-girlfriend Missy Pool at the hotel on the night before an engagement party for him and de Lesseps.

In an odd twist, sources at the hotel thought that D’Agostino was out carousing on Wednesday with Michael Wainstein, the estranged husband of another “Real Housewives” star, Jules Wainstein. But we’re told that D’Agostino was in fact with a pal who merely has a similarly compact frame to Wainstein.

Meanwhile, a source close to D’Agostino says their female companions were just friends.

Although de Lesseps recently said in an interview with Andy Cohen that she believes her estranged businessman beau was faithful during their marriage, he seems to be making up for lost time — all seven months of it.

Last weekend, a source told Page Six that D’Agostino was “officially on the prowl” after he was spotted at Le Bilboquet in Sag Harbor, “making a move on romance-novel cover queen . . . Cindy Guyer.”

His way with the ladies was also the “last straw” for de Lesseps. The pair had been struggling to keep their “passionate” relationship afloat, but after Page Six reported that D’Agostino went to Hamptons dive bar Murf’s to see an ex-girlfriend while de Lesseps was at Jill Zarin’s summer party, de Lesseps told Cohen, “I didn’t know about it. I found out about it the next day in the press. So that, for me, was the final straw. I was like, ‘I can’t do this anymore.’ ”