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While Luann de Lesseps deals with the fallout from her humiliating arrest, her ex-husband Tom D’Agostino is planning what pals are calling an “unwedding party” on the anniversary of their doomed nuptials.

The bash — to celebrate D’Agostino’s 51st birthday — is set to take place in Palm Beach, Fla., on New Year’s Eve.

The “Real Housewives of New York” star was cuffed last weekend for disorderly intoxication and battery against a cop.