Red Carpet Arrivals

Newly-engaged presenter Reese Witherspoon looked '60s chic in a classic Giorgio Armani Prive black and white gown paired with Neil Lane diamonds and satin Roger Vivier heels.

"It was made for me by Francisco Costa," Jennifer Lawrence said of her red hot Calvin Klein Collection gown. Like the first-time nominee's dress, accessories were minimal and included a Chopard bangle and studs, Jimmy Choo heels and a metallic clutch by Judith Leiber.

"It's like a house of mirrors," supporting actress nominee Melissa Leo said about her unique dress. "Marc Bouwer built it specially for me." Leo is nominated along with Fighter co-star Amy Adams. "I love working with people who are on their game and Mark, Christian and Amy are those kinds of people." Her jewelry by Jay Carlile for Forevermark served as the finishing touch.

Hailee Steinfeld

took part in creating her ballet pink hand-embroidered tulle tea-length Marchesa dress. "When I heard I was coming, I drew something out and this is exactly what I had in mind. I love it, and I'm absolutely in love with it." She accessorized her elaborate updo with a coordinating bag and shoes, both by Ferragamo, and a thin platinum headband by Fred Leighton, which featured 10 carats of diamonds.

The always demure nominee chose a textured, short-sleeve Chanel column gown, Jimmy Choo heels and showcased sparkling Harry Winston diamond earrings with sleek blonde locks.

Co-host Anne Hathaway matched her lipstick to her vintage scarlet Valentino bustle gown and added over $10 million in Tiffany & Co. jewels for the first of her many stunning Oscars looks.

"The adrenaline has been flowing since early this morning," said Mandy Moore who arrived in a glittering Monique Lhuillier gown, Chopard jewels and a sophisticated updo. Moore will perform her song from Tangled and then plans to hit the after parties. "I'll breathe a huge sigh of relief and change into a more comfortable dress."

Nominee Amy Adams set off her fiery locks in a femme fatale midnight-blue L'Wren Scott gown accented with over 60-carats of carved emerald Cartier jewelry.

"I tried on my dress three nights ago and I didn't want to sleep. I didn't want to take it off," said presenter Jennifer Hudson about her tangerine orange Atelier Versace gown. "I'm excited and nervous. The first time I was at the Kodak was for the American Idol finale and now I'm here handing someone an Oscar, it's incredible." She completed the look with $1 million worth of Neil Lane jewels.

Mila Kunis

made a stunning entrance in a romantic lavender Elie Saab gown paired with a loose chignon, Neil Lane diamond danglers and a tennis bracelet.

Presenter Cate Blanchett wore a pleated silk chiffon Givenchy Couture gown in a pale wisteria lavender hue with Van Cleef & Arpels jewelry. Her tassel diamond bracelet featured 127 diamonds on it, and each of her earrings includes a 3-carat yellow diamond surrounded by white diamonds.

Scarlett Johansson

wowed from all 360 degrees as she revealed the cut-out back of her berry-hued Dolce & Gabbana gown. She finished the look with a pair of ruby earrings and a statement ring, both by Anna Hu.

Presenter Halle Berry was the picture of femininity in a crystal-encrusted Marchesa corset gown with silk tulle ruffles that she accented with Neil Lane diamonds.

Performer Gwyneth Paltrow rocked a high-octane, low-cut platinum sheath from Calvin Klein Collection with matching Brian Atwood ankle-strap heels and a Louis Vuitton brooch, ring and earrings.

Presenter Hilary Swank wore a Gucci Premiere couture strapless gown and matching Gucci crystal-encrusted heels. The gown’s top featured metallic crystals, while ostrich feathers dyed different degradations of gray made up the skirt. She finished the look with jewelry by Anna Hu and a satin Roger Vivier clutch.

Nominee Nicole Kidman wore a sculpted Asian-inspired embroidered gown by Dior with over 150 carats of Fred Leighton vintage diamonds. Her red Pierre Hardy heels added a pop of color.

"Just remember it," the reigning Best Actress title-holder advised this year's nominees. Sandra Bullock went bright in a scarlet Vera Wang design with Harry Winston diamonds and a VBH envelope clutch.

Sharon Stone

chose a black Christian Dior silk crepe one-shoulder gown with an ostrich feather detail for her turn down the red carpet.

Music icon Celine Dion hit the red carpet in a long-sleeved Giorgio Armani Prive dress and Van Cleef & Arpels jewels. Dion will perform Smile during the memoriam segment of the show.

Helen Mirren

looked statuesque in a strong-shouldered silver Vivienne Westwood gown that she accented with Sergio Rossi heels, a Ferragamo clutch and Cartier diamonds.

Natalie Portman

looked glamorous in a plum off-the-shoulder Rodarte gown, Tiffany & Co. tassel earrings, a red Roger Vivier clutch and Jimmy Choo heels but the mom-to-be had another fashion moment in mind: "Sweats, messy hair and no makeup is the biggest luxury of all."

The Best Supporting Actress nominee collaborated with her Alice in Wonderland costume designer Colleen Atwood to celebrate "film rather than fashion." The result: an 1880s-inspired black velvet gown that she paired with Solange Azagury-Partridge earrings and a Lulu Guinness fan-shaped clutch.

-Los Angeles, CA - 02/27/2011 - The 83rd Academy Awards - Arrivals at The Kodak Theater.-PICTURED: Marisa Tomei-PHOTO by: Kyle Rover/startraksphoto.com-KRLv12023Startraks Photo New York, NY For licensing please call 212-414-9464 or email sales@startraksphoto.com marisa tomei

Four-time nominee Annette Bening (who is nominated tonight for her role in The Kids Are Alright) dazzled in her embellished gunmetal Naeem Khan gown and 66-carat emerald Lorraine Schwartz earrings.

Who says navy doesn’t go with black? Presenter Robert Downey Jr. wore a satin-edged midnight-blue tuxedo by Prada, while his wife, Susan Downey chose a slinky noir column.

Gorgeously bronzed duo Matthew McConaughey and Camila Alves glowed on the red carpet. McConaughey wore a black tux from Dolce & Gabbana, while Alves paired her Kaufmanfranco gown with Lorraine Schwartz jewelry.

Eco-conscious couple Colin Firth and Livia Giuggioli gave a nod to green chic (and Firth's nomination) with Giuggioli's custom gown, made from 11 different dresses of the era of The King’s Speech.

Before presenting an award alongside Nicole Kidman, Hugh Jackman (in Salvatore Ferragamo) joined wife Deborra-Lee Furness at the Kodak Theatre.

New mom Penelope Cruz glittered in a crimson silk gown with a revealing deep-V neckline by L'Wren Scott-each of the sequins on the dress was hand-embroidered-and she accessorized with Chopard jewelry.

From walking the red carpet in vintage Valentino to shimmying onstage in this silver, fringed Oscar de la Renta- Anne Hathaway was stunning in each of her several costume changes.

Nominee Mark Wahlberg (in Giorgio Armani) squired wife Rhea Durham (in Naeem Khan) to the big event.

Presenter Justin Timberlake escorted his mother down the red carpet in a custom Tom Ford tuxedo and a rose gold watch from Cartier.

Florence Welch

, who will perform the Oscar-nominated song “If I Rise” from 127 Hours, wore a long-sleeve Valentino gown with a tiered skirt.