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The holiday appears to have put Luann de Lesseps in high spirits.

We’re told the “Real Housewives” star put on quite a display at a party at fashion financier Chris Burch’s Southampton home Tuesday night, first “storming through” a recital by a revered pianist, then “slobbering over” a handsome guest, and finally getting into a loud argument about her ex-husband.

But de Lesseps denied the eyebrow-raising behavior, telling us, “I have manners.”

Spies said de Lesseps showed up late at the bash and walked right across a patio that had been set up as a stage for famed Chinese concert pianist Lang Lang during his performance. However, de Lesseps told us that — while she did cross the patio — she didn’t cut in front of the performer.

Later, we’re told, she “threw herself at” another guest.

But de Lesseps told us, “I didn’t hit on anyone,” adding enigmatically, “I have a boyfriend.”

Finally, we hear de Lesseps happened across a pal of ex Tom D’Agostino Jr. and loudly announced, “I don’t associate with people who know Tom.” It’s the last in a recent slew of exuberant outings for de Lesseps.

Her agent told us, “What I can confirm is that Luann and Chris are good friends. She had a wonderful time last night.”