Luann de Lesseps (née Nadeau, previously D'Agostino; born May 17, 1965) is an American television personality, model, author, and singer. In 1993, she married French entrepreneur and aristocrat Count Alexandre de Lesseps; they divorced in 2009 but she retained the courtesy title "countess" until her remarriage in 2016. In 2008, de Lesseps came to prominence after being cast in the reality television series The Real Housewives of New York City, which documents the lives of several women residing in New York City.
Born LuAnn Nadeau, she was raised in Berlin, Connecticut, where she grew up with her six siblings, and where her father owned a construction company. She has said her father is of Algonquin and French descent and that her mother is French Canadian. In the last episode of RHONY set in Morocco Afton, (Season 4, episode 10, "Last Call, Morocco!", airdate June 9, 2011), de Lesseps shared that she had captained her high school varsity softball team.