Red Carpet Arrivals

Presenter Charlize Theron turned heads in a Dior Haute Couture amethyst and lilac bustier gown with rose and draped details, created especially for her by John Galliano for Dior. The blond beauty accessorized with shoes and a clutch also by Dior, and 17.25 carat diamond earrings and a vintage marquise diamond wave bracelet from Harry Winston.

Presenter Jennifer Lopez chose an iridescent pink silk organza gown from Armani Prive's Spring 2010 collection. The mermaid gown featured a crescent-shaped bustier that cascaded into a dramatic side train lined with Swarovski rock crystals. Lopez finished off the look with Cartier jewels and Salvatore Ferragamo satin heels.

Demi Moore

was stunning in a ruffled silk organza gown from Atelier Versace. Finishing touches included Van Cleef & Arpels face-framing drop earrings and diamond cuffs, a Salvatore Ferragamo clutch and platform satin sandals.

After initially choosing a blue dress, Up in the Air star and Best Supporting Actress nominee Anna Kendrick went with a soft pink off-the-shoulder, hand-draped gown from Elie Saab Couture, Kwiat jewels, Sergio Rossi platform sandals and a Judith Leiber clutch for her walk down the red carpet. "I never thought I'd wear pink...but pink it is!" she said.

Best Actress nominee Meryl Streep looked white-hot in a gorgeously draped, long-sleeve gown by Chris March. The Julie & Julia star (who has been nominated for an Oscar 16 times!) added a pair of diamond and black onyx bracelets, diamond earrings and a diamond and onyx ring all by Fred Leighton, wore Jimmy Choo heels and carried a silver crystal mesh clutch by Swarovski.

Best Actress nominee Sandra Bullock looked luminous in a metallic and lace Marchesa gown, Celestina clutch and Neil Lane diamonds. The Blind Side star wouldn't predict a potential win, but she did express worry over reports that the Oscars stage could prove tricky for stars in stilettos. The star, in Jimmy Choo platforms, said, "If I step up on that stage tonight, I just don't want these heels to pull this body down!" she said.

Best Supporting Actress nominee Penelope Cruz looked ravishing in a bordeaux duchess satin draped gown by Donna Karan. "They made it for me," the actress admitted. The Nine star complemented her ensemble with Sergio Rossi black satin heels, a buckled Roger Vivier clutch, pear-shaped diamond drop earrings and stacked diamond bracelets by Chopard.

Kate Winslet

wore Yves Saint Laurent to accept the Oscar for Best Actress last year and went with the label once again this year. Winslet accessorized her Atelier Yves Saint Laurent bustier evening gown with the label's sandals and clutch and Tiffany & Co. jewels.

Best Actress nominee Carey Mulligan looked to Prada for a big-night gown with a touch of whimsy: the bustier design is embellished with Swarovski crystal flowers as well as tiny forks, knives, scissors and other charms. She finished the look with a simple satin clutch and sandals from the label, and shoulder-dusting diamond earrings from Fred Leighton.

Avatar beauty Zoe Saldana wore a fresh-from-the-runway couture gown from Givenchy by Riccardo Tisci with the designer's violet suede shoes and Lorraine Schwartz amethyst jewels. The purple ombre design combined a sparkling bodice with a sculptured tulle skirt.

Crazy Heart nominee Maggie Gyllenhaal chose Fred Leighton jewels to go with a satin column gown from her friend Dries Van Noten. "He designed my wedding dress," said the actress, who had difficulty choosing between the three Oscars options offered by the designer. "I couldn't decide until late yesterday."

Inglourious Basterds star Diane Kruger looked elegant in head-to-toe Chanel. Her couture gown was made of layers of embroidered chiffon and featured an elegant black lace neckline. Kruger accented the cream and black gown with Chanel's black and white diamond "Camelia Nervure" brooch (elegantly pinned in her hair), the "Spirale" diamond ring, white gold and diamond "Camelia" studs and a Jaeger-LeCoultre diamond bracelet timepiece.

"Thank you!" said a gracious Cameron Diaz when she received a compliment on her glittering Oscar de la Renta gown, which she accessorized with a Roger Vivier clutch, gold satin Brian Atwood heels and a priceless white gold and diamond ring from the Cartier Private Archive collection.

The Runaways

star Kristen Stewart stood out from the sea of nude and vibrantly colored dresses in a strapless midnight blue silk satin organza gown by Monique Lhuillier. The Twilight Saga actress finished the look with a diamond bracelet by H. Stern and Bally shoes.

Best Actress nominee Gabourey Sidibe was all smiles in a cobalt blue off-the-shoulder dress by Marchesa, jeweled Montblanc satin clutch and over 180-carats of Lorraine Schwartz jewelry. “I don’t believe my life right now. This is craziness!” the breakout star said.

Fashion designer Nicole Richie showed off her signature vintage style in a multi-colored sequined Reem Acra gown, Lorraine Schwartz diamond stud earrings, Christian Louboutin open-toe heels and a Judith Leiber clutch.

Rachel McAdams

floated down the red carpet in Elie Saab’s pastel print gown from the Spring 2010 Haute Couture collection. "It feels like a Georgia O'Keefe painting," said the actress. "I've just never seen anything like it." She accessorized her look with blush satin Sergio Rossi heels, Salvatore Ferragamo’s lilac satin clutch and statement-making rose-cut Lorraine Schwartz diamond pendant earrings.

Julianne Moore

lit up the stage in a custom beaded platinum gown by Francisco Costa for Calvin Klein Collection. The actress mirrored the dress's shimmer with Bulgari diamond bracelets.

Best Supporting Actress winner Mo'Nique posed with her husband Sidney Hicks in an ensemble inspired by first African-American to win an Academy Award. "This is actually the same color that Hattie McDaniel wore in 1940 when she walked this carpet," the actress said of her cobalt-blue Tadashi Shoji dress. "This is also the same flower, the gardenia, that she wore in her hair." Aside from the floral ornament, Mo'Nique accessorized her gown with yellow diamonds from Chopard, a Daniel Swarovski pale gold clutch and sandals from Jimmy Choo.

Best Actress nominee Helen Mirren glistened in a beaded silver satin crepe and tulle Badgley Mischka gown, clutch and shoes. The Last Station star topped off her look with a 125-carat oval-shaped diamond necklace and drop earrings by Chopard.

Presenter Michelle Pfeiffer was breathtaking in a deep crimson moire taffeta gown from Carolina Herrera. The veteran actress added a multi-hued bangle and Sergio Rossi platform pumps to the single-shoulder design.

Presenter Miley Cyrus walked the red carpet with a Judith Leiber clutch, wearing Lorraine Schwartz jewels and a strapless champagne Jenny Packham gown with hand-beading and sequins.

The multi-talented Queen Latifah brought out the sparkle in a bead-embellished lavender satin gown from Badgley Mischka Couture with a jewel-encrusted Judith Leiber clutch and diamonds and pink sapphires from Chopard.

Presenter Tina Fey chose a beaded black leopard print, one-shoulder Michael Kors gown. The 30 Rock star finished the look with satin Jimmy Choo heels, an elegant black Kotur clutch and drop earrings from Stephen Russell.

Amanda Seyfried wowed in Giorgio Armani Prive's sculptural sea foam green silk gown, Brian Atwood sandals, a metallic Salvatore Ferragamo clutch and an armful of dazzling bangles from Lorraine Schwartz. The intricate design featured a structured Swarovski crystal bustier and a full skirt made of mesh panel overlays.

Presenter Sarah Jessica Parker went custom in a pale yellow silk gown from Chanel. "I love the silhouette and I love the color," said the star. She complemented the dress's silver embroidered bodice with stacks of bracelets, 19th-century diamond earrings and a nine-carat ring from Fred Leighton.

She was a standout in a ruffled fuchsia gown from Marchesa, Fred Leighton jewels and Christian Louboutins, but Up in the Air star Vera Farmiga claimed that when it comes to daily life she lives under the radar. “No one ever recognizes me,” the Best Supporting Actress nominee said. “I had to tell my driver I was nominated for an Oscar!”

Presenter Elizabeth Banks chose a lavender sleeveless Versace gown with a layered chiffon train. She finished the look with a matching Ferragamo clutch, suede Sergio Rossi platform pumps and 19th century diamond flower earrings by Fred Leighton.

With her Grammy Award-winning husband Robin Thicke on her arm, Paula Patton looked stunning in an orange faille gown by Carolina Herrera, gunmetal Sergio Rossi peep toe pumps, a Judith Leiber clutch and Martin Katz jewels. Her film Precious: Based on the Novel Push by Sapphire was nominated for Best Picture.

Presenter and Avatar star Sigourney Weaver matched the red carpet in an elegant one-shoulder dress from Lanvin, accented with a Neil Lane brooch, Jimmy Choo shoes and simple black bow at the waist.

Law and Order SVU

star Mariska Hargitay played up her famous curves (her mother was Jayne Mansfield!) in a ruffled navy Vera Wang gown with a mermaid train and Fred Leighton jewels.