The subject of John Singer Sargent's most famous painting was twenty-three-year-old New Orleans Creole Virginie Gautreau, who moved to Paris and quickly became the "it girl" of her day. A relative unknown at the time, Sargent won the commission to paint her; the two must have recognized in each other a like-minded hunger for fame. Unveiled at the 1884 Paris Salon, Gautreau's portrait generated the attention she craved-but it led to infamy rather than...