08/28/2012 01:33 am ET Updated Sep 14, 2012

'The Real Housewives Of New York City': LuAnn's Secret Night With Younger Man Exposed (VIDEO)

The Countess LuAnn de Lesseps tried her hardest to keep her 3 a.m. tryst a secret, but it doesn't look like it's going to be able to stay that way. It all happened during the ladies' vacation to St. Barth's on "The Real Housewives of New York City" (Mon., 10 p.m. ET on Bravo). The women all went out for a night of fun, where they met a dashing Frenchman, Tomas.

Long after the other ladies retired for the night, LuAnn returned. She claimed that she'd run into some old Italian friends of hers, but the other girls are certain they only heard one voice with her.

But the real problem is that Heather not only heard only one voice, she saw who that voice belonged to. "If LuAnn is going to continue to perpetuate this Italian story, I’m just really uncomfortable with it. It puts me in a bad position with the other girls and with Jacques," Heather said.

Jacques is LuAnn's long-term, live-in boyfriend, so her discomfort is certainly understandable. To make matters worse, LuAnn isn't even done with Tomas. He showed up for dinner at the end of the episode.

See how it plays out as "The Real Housewives of New York City" continues Mondays at 10 p.m. ET on Bravo.

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