Countess LuAnn de Lesseps needs a lesson in class

LuAnn “The Countess” de Lesseps should take a lesson from her own etiquette book.

At New York magazine’s summer kickoff party at the Kimberly Hotel's Upstairs rooftop bar on Tuesday night, we spied the class-obsessed “Real Housewife” and boyfriend Jacques Azoulay coming out of a one-person bathroom ... together.

Umm, we don’t think a chapter in de Lesseps’ book, “Class With the Countess,” covers tandem bathroom visits.