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IT’S too bad video cameras for “The Real Housewives of NYC” weren’t trained on the reality show’s cast member Countess LuAnn de Lesseps at the Southampton wedding of BlueStar Jets owner Todd Rome and his bride, Vanessa Brahms.

In front of 200 guests at Nello Summertimes last Thursday, the high-spirited countess commandeered the mike from Andy Hilfiger’s band and sang two songs. “She knocked over the drum set while smiling at the horrified guests,” a source said.

Then, LuAnn, who was there with her husband, Alexandre Count de Lessups, seemed overwhelmed with affection for her fellow guests. “She was trying to make out with women and married men,” the source said. “A pregnant wife caught her in the act, stormed off and walked home in disgust.”

Alexandre “tried to make her leave and was seen throwing her to the ground in the parking lot,” our spy continued.

“She wasn’t just kissing the married men, she was also grabbing their [crotches],” another witness told The Post’s Braden Keil, adding that one male victim was the escort of one of her TV co-stars.

LuAnn and her husband angrily denied the alleged raucous behavior. “None of it is true. My husband was with me the entire time,” the countess fumed. Alexandre added, “This sounds like a plot.” He also denied shoving her, saying, “She tripped with her high heels in the parking lot of Nello’s. It is gravel, not hard ground. I nearly fell.”

Todd Rome told us, “At these parties, people always get frisky. All I can say is that she didn’t try to grab me.”

A few weeks ago, the countess caused a scene at Manor Lounge in Chicago by warbling an over-the-top, Marilyn Monroe-style “Happy Birthday” to a complete stranger, “and the birthday boy was not amused,” a source said. That didn’t happen either, insisted the countess.

PHOTOS: The Countess of ‘Housewives’