"An Education" star Carey Mulligan, nominated for a best actress award, wore a strapless dress by Prada embellished with small scissors, forks and knives.

"Twilight" star Kristin Stewart wore a navy blue Monique Lhuillier strapless gown.

Meryl Streep wore a dress by former "Project Runway" contestant Chris March.

"Precious" actress Gabourey Sidibe wore a purple Marchesa gown.

Model Elisabetta Canalis and actor George Clooney, who was nominated for a best actor award for his role in "Up in the Air," arrived at the Oscars.

Cameron Diaz wore a Fall 2010 champagne tulle gown with metallic ribbon embroidery by Oscar de la Renta.

Kate Winslet, who won an Oscar last year, posed on the red carpet wearing Yves Saint Laurent.

Queen Latifah on the red carpet.

Actress Penelope Cruz wore a deep burnt-red Donna Karan gown.

Sarah Jessica Parker, with husband and actor Matthew Broderick, wore a Chanel gown.

Jennifer Lopez posed with Demi Moore, who wore an Atelier Versace strapless silk organza gown.

Diane Kruger wore a camellia Chanel haute couture gown with black lace accents.

Actress Amanda Seyfried chose Armani Prive for the red carpet.

Charlize Theron wore a dress by Dior by Galliano.

Best supporting actress nominee Maggie Gyllenhaal wore a watercolor-printed gown by Dries van Noten.

Actress Elizabeth Banks wore a pale purple-gray Versace gown.

"Avatar" star Zoe Saldana's Givenchy Haute Couture gown featured a restrained glittery bodice, which gave way to a long, ombre ruffled gown.

Anna Kendrick, who starred in "Up in the Air," wore a tulle and lace gown with gathered shoulders and rose details. She said it was a last-minute choice.

Mariah Carey, who was in "Precious," showed up in a midnight-blue gown.

"Up in the Air" star Vera Farmiga wore a ruffled Marchesa gown.

Sandra Bullock, won a best actress award for "The Blind Side," wore a Fall 2010 Marchesa gown dripping in gold sequins.