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A simple photoshoot involving Martha Stewart and Luann de Lesseps‘ ex-husband has somehow exploded into an all-out war — including a pitched battle over a pie dish.

For the current issue of New York Magazine, Stewart appeared in a feature in which famous New Yorkers revisited their first apartments in the city — which, in Stewart’s case, happens to be an Upper East Side penthouse that now belongs to Tom D’Agostino, the businessman who just divorced “Real Housewives of New York” star de Lesseps after a fleeting marriage.

Sources close to D’Agostino say the entire caper seemed odd from the beginning. The first they heard of the project was when Stewart herself showed up unannounced, and the doorman called D’Agostino, saying, “I know this sounds weird, but Martha Stewart is downstairs and she wants to look at your apartment.”

Team Tom thought something was amiss during the Sept. 21 shoot when Stewart backed off her claim that she had lived in the apartment, saying she only stayed there for a few months one summer.

D’Agostino insiders even suspected that the whole thing could be an elaborate payback for a public spat that Stewart got into with de Lesseps in 2015 when the former Countess heard Stewart called de Lesseps’ Bravo show “lowbrow, very B-list.”

Things reached a simmer when the New York Magazine piece hit stands and turned out to include a number of remarks that seemed to D’Agostino’s camp to be barbed. Stewart appeared to curl her lip at D’Agostino’s recent remodel, saying, “It was very beautiful and light-filled and airy — and all white, the way it was meant to be. Now it’s much more enclosed and dark!,” and sprinkling on for good measure, “And it’s more masculine now. I mean, he’s a bachelor now, isn’t he?”

But the situation boiled over when Stewart accused D’Agostino of not returning her “favorite apple-pie dish” after she baked a pie for her visit. A source close to D’Agostino told us that it was just a cheap Pyrex number and that they had tried to return it.

As of press time, the pie dish was still in the wind.

We’re told that when a pal of D’Agostino’s threatened to expose the story in the press, a Stewart lackey snarled, “You wouldn’t dare drag Martha’s name through the mud!”

Reps for Stewart and D’Agostino didn’t get back to us.