 Cousteau married entertainment journalist Ashlan Gorse on September 25, 2013 in a civil ceremony at the City Hall of the 8th arrondissement in Paris, and had a second ceremony on September 28, 2013 at the Château d’Esclimont in Saint-Symphorien-le-Château.They have one daughter (born in May 2019) 

Cousteau has co-written two books, "Going Blue" and "Make a Splash".