Saint Laurent outside one of his shops with De La Falaise (right) and the French model and muse, Betty Catroux (left).
Saint Laurent outside one of his shops with De La Falaise (right) and the French model and muse, Betty Catroux (left).
John Minihan/Hulton Archive/Getty Images
Saint Laurent and De La Falaise backstage at the InterContinental hotel, Paris, in 1982.
Saint Laurent and De La Falaise backstage at the InterContinental hotel, Paris, in 1982.
Guy Marineau
De La Falaise at the home of British interior designer, John Fowler, in the late 1960s.
De La Falaise at the home of British interior designer, John Fowler, in the late 1960s.
Mario Buatta
De La Falaise with Spanish fashion designer and longtime friend of Saint Laurent, Fernando Sanchez, in 1969.
De La Falaise with Spanish fashion designer and longtime friend of Saint Laurent, Fernando Sanchez, in 1969.
Jano Herbosch
An image from a 1975 Women's Wear Daily feature which described De La Falaise as "one of Paris' most unconventional -- and consistent -- young beauties."
An image from a 1975 Women's Wear Daily feature which described De La Falaise as "one of Paris' most unconventional -- and consistent -- young beauties."
Guy Marineau
De La Falaise with Saint Laurent (second from right) and the co-founder of YSL, Pierre Bergé (far left), on the day of her marriage to French writer Thadée Klossowski De Rola (far right).
De La Falaise with Saint Laurent (second from right) and the co-founder of YSL, Pierre Bergé (far left), on the day of her marriage to French writer Thadée Klossowski De Rola (far right).
Courtesy Christopher Petkanas
An evening suit from Yves Saint Laurent's spring-summer 1981 couture collection, as modeled by De La Falaise before its release.
An evening suit from Yves Saint Laurent's spring-summer 1981 couture collection, as modeled by De La Falaise before its release.
Guy Marineau
De La Falaise (left), pictured with Yves Saint Laurent and his other longtime muse, Betty Catroux (right).
De La Falaise (left), pictured with Yves Saint Laurent and his other longtime muse, Betty Catroux (right).
Guy Marineau
De La Falaise pictured in 2010, the year before her death.
De La Falaise pictured in 2010, the year before her death.
Abdelhak Senna/AFP/Getty Images
A 1991 photograph showing De La Falaise and Yves Saint Laurent at the Palais Galliera for a reception honoring Hubert de Givenchy.
A 1991 photograph showing De La Falaise and Yves Saint Laurent at the Palais Galliera for a reception honoring Hubert de Givenchy.
Pierre Guillaud/AFP/Getty Images