Don’t be irritated by its hype-y title. “La Joconde Nue” (The Nude Mona Lisa) is a superb exhibition now on at the Château de Chantilly, a 20-minute drive from Paris Charles de Gaulle. Its centerpiece is Leonardo da Vinci’s other Mona Lisa, a topless sitter whose enigmatic gaze floats above a decidedly masculine body. Leonardo was in love with his male assistant when he made it, and the large drawing—bought by Henri d’Orléans, the French Duke of Aumale, in 1862—is fascinating in its gender ambiguity. The painting dates from around 1515, 12 or so years after the clothed Mona Lisa was painted, and the similarities between the two works are striking. Also on display are Renaissance works that fall into this pictorial genre, including the major painting Naked Woman, Venus—lent by the Hermitage in Saint Petersburg—an exact replica of the Paris drawing. “The Nude Mona Lisa” runs through October 6. —Laure de Gramont