The French designer was synonymous with striped sweaters and Left Bank insouciance.
The music star had launched the collection last February during New York Fashion Week.
Inventories are being kept tight in hope of increasing full-price selling and reducing markdowns.
Lindsey Wixson, Chloë Sevigny, Monique Péan and Richard Phillips were among guests taking the scene in.
Elizabeth Olsen, Liv Tyler, Carine Roitfeld, Inez and Vinoodh, Rachel Zoe and Terry Richardson attended the show.
Jessica Chastain and Olivia Wilde both made time on Valentine’s Day to stop by the show.
The show at Galleria Carla Sozzani at 10 Corso Como store will celebrate the work of the late husband of Anna Piaggi, the legendary Italian fashion editor.
Dylan Lauren was sporting a candy-striped cast on her left arm at her father’s fashion show Thursday morning.