Loulou de la Falaise (French pronunciation: ?[lu.lu d? la fa.l?z]; 4 May 1948 – 5 November 2011) was a fashion muse and designer of fashion, accessories and jewellery associated with Yves Saint Laurent.
The daughter of an Anglo-Irish fashion model and a French marquis, she helped inspire Saint Laurent's 1966 women's tuxedo Le Smoking and his see-through blouses, according to The Independent.