Oscar 2010 Red Carpet

Cameron Diaz in Oscar de la Renta.

Twilight's Kristen Stewart in Monique Lhuillier.

Carey Mulligan, a best supporting actress nominee, went for embellished black.

Demi Moore in tiered, ruffled Versace.

Diane Kruger goes über-classic in black and cream Chanel.

Elizabeth Banks in Versace.

Gabourey Sidibe was over-the-moon ecstatic about her sapphire Marchesa dress — and her first turn at the Oscars.

One of our favorites of the night — Maggie Gyllenhaal in a painterly floral by Dries Van Noten.

Mariah Carey showed just the right amount of leg and was right on trend in her one-shoulder blue gown and nude pumps.

Best-actress winner  Sandra Bullock shines like her long-awaited statue itself in this gold mermaid gown by Marchesa.

Mariska Hargitay in Vera Wang.

Penélope Cruz in Donna Karan.

Adored these soft-washed colors by Elie Saab on Rachel McAdams.

Sarah Jessica Parker wowed in Chanel.

Sigourney Weaver was very ladylike in Lanvin.

Tina Fey went for old-school glamour in Michael Kors.

Vera Farmiga in hot-pink Marchesa.

Zoe Saldana wore the final look from Givenchy's 2010 couture show.

Miley Cyrus in Jenny Packham.

Virginia Madsen

Best supporting actress winner Mo'Nique.

Nicole Richie covered up beautifully in Reem Acra.

Queen Latifah

No traces of vamp for Deborah Ann Woll of True Blood, who wore Nicole Miller.

Helen Mirren epitomizes the concept of being fabulous at every age in Badgley Mischka.

Best-director winner Katherine Bigelow would look just as good on the other side of the camera.

Best-actress nominee Meryl Streep stood out in pure white.

Molly Ringwald made a surprise appearance to pay tribute to director John Hughes.

Kate Winslet looking statuesque in a dress that definitely got results, from Yves Saint Laurent.

Jennifer Lopez stunned in Armami Privé.

Charlize Theron wore one of the night's hottest colors, pink.