Eloise in Paris was first published in 1957, the second of the Eloise quartet, and an immediate bestseller. Kay Thompson and Hilary Knight traveled to Paris to research the book, and the illustrations are dotted with the celebrities they knew there: Richard Avedon takes Eloise's passport photograph; Christian Dior prods her tummy, while his young assistant, Yves Saint Laurent, looks on; Lena Horne sits at an outdoor café.