Celebrities donned their best Prada gowns in honor of the Costume Institute's new exhibit, "Schiaparelli and Prada: Impossible Conversations," as others grabbed the closest haute couture they could find.
Sarah Jessica Parker went one better and hit the red carpet with legendary fashion designer Valentino Garavani himself — wearing a silk taffeta floral printed gown, designed by her evening's escort.
Gwyneth Paltrow (in a Prada halterneck dress), Carey Mulligan (also in Prada) and Jessica Biel (in mid-calf length Prada and escorted by beau Justin Timberlake) were among the few who decided to forgo the floor-length trend and wear knee-and-calf length gowns.
Beyoncé Knowles, who gave birth to her daughter Blue Ivy Carter in January, turned heads in a sheer, full-length Givenchy gown with a purple feather train over a corseted bodysuit.
The singer's sister Solange Knowles wore a peplum-waisted canary yellow dress designed by Rachel Roy, while "Mad Men" star January Jones also opted for yellow, and a peplum, designed by Versace.
Rihanna wore Tom Ford, Jessica Alba wore a Michael Kors gold-lame, one-shoulder-goddess gown and Claire Danes, from TV's "Homeland," wore a white silk J. Mendel gown and Louboutin shoes. Danes was there with her husband Hugh Dancy.
Anna Wintour, and other Vogue editors in attendance, all wore pink, a signature Schiaparelli color.
Photos provided by PatrickMcMullan.com.