Lifestyle Style Costume Institute Gala: See the Dresses! J.Lo, Renée and a pregnant Naomi Watts wow the NYC crowd. By Andrea DeSimone By People Staff Published on May 8, 2007 04:00 PM Share Tweet Pin Email Trending Videos 01 of 16 JENNIFER LOPEZ Gilbert Flores/Celebrity Photo The singer was ’40s glam in a long silver beaded Marchesa dress with Roger Vivier clutch. 02 of 16 JENNIFER GARNER RD/Leon/Retna Escorted by designer Valentino himself, the normally casual mom wows in a bright red vintage Valentino Haute Couture gown and Neil Lane jewels. 03 of 16 NAOMI WATTS Michael Loccisano/FilmMagic The mom-to-be doesn’t compromise style for comfort in her stunning black-and-navy ruffled Zac Posen design and Neil Lane diamonds. 04 of 16 KATE MOSS Humberto Carreno/Startraks The supermodel-turned-designer puts one of her own TopShop creations to the red carpet test and gets rave reviews. 05 of 16 LUCY LIU Evan Agostini/Getty The petite star pops in a vibrant purple Zac Posen number with ruffled train and Fred Leighton jewels. 06 of 16 JENNIFER HUDSON Lawrence Lucier/FilmMagic Before performing for the A-list crowd, the Oscar winner sparkles on the red carpet in a one-shouldered Michael Kors gown with Lorraine Schwartz jewels. 07 of 16 RENéE ZELLWEGER Dimitrios Kambouris/WireImage The actress goes for a classic look in a slinky Carolina Herrera beaded dress and Van Cleef & Arpels jewels. 08 of 16 JESSICA SIMPSON Jamie McCarthy/WireImage The Blonde Ambition star shows off her tan in a plunging metallic Roberto Cavalli halter dress with Lorraine Schwartz gems. 09 of 16 LIV TYLER Seth Wenig/AP The raven-haired beauty sets off her creamy complexion in a bright teal, custom silk Calvin Klein Collection gown and Van Cleef & Arpels jewels. 10 of 16 CAMERON DIAZ Seth Wenig/AP The Shrek the Third star wears a playful fuscia silk organza dress from Dior by John Galliano paired with turquoise stone jewelry by Fred Leighton. 11 of 16 LINDSAY LOHAN Gilbert Flores/Celebrity Photo In a Zac Posen gown, with Bally custom-made accessories and Van Cleef & Arpels jewels, the actress arrived fashionably late to the event. 12 of 16 SCARLETT JOHANSSON Peter Kramer/Getty Another night, another designer! The actress and Louis Vuitton model goes with a Stella McCartney party dress, black fishnets and Van Cleef & Arpels jewels. 13 of 16 MARY-KATE OLSEN Dimitrios Kambouris/WireImage The fashionista abandons her grunge look for a floor-length feathered Lily et Cie gown with Aliah belt and Fred Leighton ring. 14 of 16 ASHLEY OLSEN BRIAN ZAK/GAMMA There’s no confusing the sisters tonight! The other Olsen looks sleek and chic in a never-been worn John Galanos belted white sheath with Fred Leighton jewels and Lily et Cie clutch. 15 of 16 SANDRA BULLOCK Peter Kramer/Getty The actress shows a sweet side in a berry-toned Alberta Ferretti strapless dress and Lorraine Schwartz flower cuff. 16 of 16 KATE BOSWORTH Dimitrios Kambouris/WireImage Paying homage to the night’s roaring ’20s theme, the actress glows in a champagne-colored Prada number and Fred Leighton jewels.