Costume Institute Gala: See the Dresses!

J.Lo, Renée and a pregnant Naomi Watts wow the NYC crowd. By Andrea DeSimone

  • MARY-KATE OLSEN photo | Mary-Kate Olsen

Credit: Dimitrios Kambouris/WireImage

Updated: Tuesday May 08, 2007 | 01:00 PM EDT

MARY-KATE OLSEN

The fashionista abandons her grunge look for a floor-length feathered Lily et Cie gown with Aliah belt and Fred Leighton ring.