GettyHollywood's Big NightBest of the 2013 Oscars Red Carpet (PHOTOS)Jessica Chastain channels Old Hollywood in Giorgio Armani Privé, while Jennifer Lawrence stuns in Dior Haute Couture. See red carpet highlights on Hollywood's biggest night. Isabel Wilkinson02.24.13 6:45 PM ETGettyGettyJessica Chastain channels Old Hollywood in Giorgio Armani Privé while Reese Witherspoon opts for Louis Vuitton. See highlights from the red carpet on Hollywood's biggest night. GettyJessica Chastain channels Old Hollywood in Giorgio Armani Privé while Reese Witherspoon opts for Louis Vuitton. See highlights from the red carpet on Hollywood's biggest night. Kevin Winter/GettyMichelle ObamaThe audience was shocked when the first lady appeared in the theater by telecast to announce the Best Picture winner, Argo. She wore a beautiful beaded metallic dress by Naeem Khan, and of course her signature bangs were front and center. Jason Merritt/Getty Jennifer LawrenceThe Best Actress winner was a crowd favorite in an ivory, strapless Dior Haute Couture dress with a massive train and a long necklace that ran down her back. Jason Merritt/GettyJessica Chastain Nominated for her role in Zero Dark Thirty, Chastain channeled old-Hollywood glamour in a custom Giorgio Armani strapless copper-toned silk satin gown encrusted with Swarovski crystals and Harry Winston jewels. “It’s a very ‘Happy Birthday, Mr. President’ kind of dress,” she said. “It reminds me of old-Hollywood glamour.” GettyAnne HathawayThe best-supporting-actress winner opted for a Prada light pink duchesse satin backless column dress. “I didn’t know what I was wearing until about three hours ago,” she said. “But this is the one that spoke to me in the end.” She added of her dress: “My mom says it’s business in the front and a party in the back.” Frederic j. BrownLiev Schreiber and Naomi WattsShe's usually in Zac Posen, but Naomi Watts (nominated for her role in The Impossible) changed things up in a structural, glittering one-shoulder dress by Giorgio Armani Privé. Jennifer AnistonAniston looked simple in a red strapless Valentino dress, Fred Leighton jewels, and a red lizard minaudière and strappy satin shoes by Salvatore Ferragamo. “It feels very princess-y,” she said of the dress. “I feel like it’s very King and I.” Jason Merritt/GettyAmanda SeyfriedSeyfreid, who performed in the Les Misérables ensemble during the show, looked stunning a pale Alexander McQueen dress, Roger Vivier shoes, and Lorraine Schwartz jewels. “They’ve been working on this for months,” she said of the dress. “I feel super lucky.” Jason Merritt/GettyAmy AdamsAdams looked regal in a strapless gray tulle dress by Oscar de la Renta. “I worked with Mr. de la Renta on it, and it was just a magical experience,” she said of the dress. Kevork Djansezian/GettyKerry WashingtonWashington—a regular on our best-dressed lists—looked unsurprisingly chic in a strapless coral satin Miu Miu belted gown with a nude tulle bustier enriched with paillettes and Swarovski crystals and a red Prada clutch. Jason Merritt/GettyQuvenzhané WallisWallis wore a blue princess dress by Armani with a rhinestone tiara. She told Ryan Seacrest of the dress: “I liked it because it was sparkling and fluffy.” There was, of course, a “special” dog purse to match. Michael Buckner/GettyCharlize TheronThe actress looked sleek in a white strapless Dior Couture dress and Harry Winston jewels. Jason Merritt/GettyJennifer Garner and Ben AffleckGarner looked chic in a custom strapless purple Gucci dress with a long ruffle down the back, while Argo director Affleck wore head-to-toe Gucci as well. Jason Merritt/GettyGeorge Clooney and Stacey KeiblerKeibler looked stunning a black Naeem Khan dress, Giuseppe Zanotti shoots, Lorraine Schwartz jewels, and a Tiffany & Co. bag. “I sewed most of the sequins on myself,” Clooney joked of his girlfriend’s dress. Frederic J. Brown/GettySally FieldThe best-supporting-actress nominee looked stunning in a bright red Valentino dress with long sleeves. Kevin Winter/GettyBarbra StreisandStreisand, a performer during the show, wore a black Donna Karan Atelier dress that actually had a name: City Lights. The black asymmetrical, bias-cut dress is a waterfall of chiffon layers encrusted with matte gold sequins and beads. Michael Buckner/GettyChristoph WaltzWaltz, who picked up the award for best supporting actor for his role in Django Unchained, wore a midnight blue tuxedo by Prada. Jason Merritt/Getty Reese WitherspoonThe presenter wore a strapless blue Louis Vuitton dress with black detail, Vuitton jewels, and old-Hollywood curls. Frederic J. Brown/Getty (L),Lester Cohen/WireImage (R)Zoe Saldana Saldana opted for ruffles in a white Alexis Mabille Couture strapless dress with appliqué flowers, Neil Lane jewels, Roger Vivier heels, and a Ferragamo clutch. Kevork Djansezian/GettyHalle BerryBerry went angular for the Academy Awards this year with a black Versace dress striped with silver crystals. “Donatella designed this because I said I want to go as a Bond girl to the Oscars, and this is what she came up with.” She paired the dress with a Le Vian Gladiator ring and onyx Adeler earrings. Frazer Harrison/GettyJennifer Hudson A far cry from her Super Bowl outfit, Hudson looked glamorous in a blue beaded Roberto Cavalli number. “It’s such a great pop of color,” she said. “It took three days of fittings, about three hours each, for me to make my decision.” Kevork Djansezian/GettyMelissa McCarthy McCarthy opted for a conservative gray long-sleeved David Meister dress. Kevork Djansezian/GettyHugh JackmanNominated for Best Actor for his role in Les Misérables, Jackman, in a Tom Ford tuxedo, joked with his Broadway pal Kristin Chenoweth on the red carpet. Jason Merritt/GettyHelen HuntThe best-supporting-actress nominee for The Sesssions wore a dress surprisingly designed by H&M. “They made a beautiful dress, and they’re going green,” she said of her dress. It did, however, have $7,000 worth of Martin Katz jewelry sewn onto it. GettyKristen StewartThe Twilight star looked beautiful in a white strapless embroidered dress by Reem Acra, Jimmy Choo shoes, and Fred Leighton jewels—but unfortunately accessorized with a pair of crutches. Jason Merritt/GettyDaniel Day-Lewis“Once you discover him, he absolutely remains with you forever,” Day-Lewis said of playing the part of Abraham Lincoln. Kevin Mazur/WireImageEddie Redmayne Redmayne looked dapper in a black single-breasted one-button Alexander McQueen shoulder tuxedo. Kevork Djansezian/GettyNicole Kidman and Keith UrbanKidman looked statuesque in a black and gold sequined gown by L’Wren Scott and Fred Leighton jewels. Jason Merritt/GettySandra BullockBullock opted for a black fully embroidered cap-sleeve gown with lace panels from the Elie Saab Spring/Summer 2013 Haute Couture collection, Harry Winston jewels, and a Daniel Swarovski clutch. Jason Merritt/GettyOctavia Spencer Last year’s best-supporting-actress winner returned in her favorite designer, Tadashi Shoji, which she paired with Lorraine Schwartz jewels. Frazer Harrison/GettyChanning Tatum“Maybe people will get naked. We’ll see,” Tatum, in a Gucci suit, joked to Ryan Seacrest about his expectations for the Oscars telecast. Frederic J. Brown/GettyJacki WeaverNominated for best supporting actress for her role in Silver Linings Playbook, Weaver looked pitch perfect in a crimson dress with an embroidered red bodice and $2 million worth of jewels. Michael Buckner/GettyEmmanuelle RivaNominated for Best Actress for her role in Amour, Riva, who turned 86 on Sunday, opted for a navy dress and cape with a slim diamond necklace. Michael Buckner/GettyRenée Zellweger“I love what she does, and I love her team,” Zellweger said of Carolina Herrera, who designed her gold column dress. Jason Merritt/GettyHarvey Weinstein and Georgina ChapmanThe Silver Linings Playbook producer arrived with his wife, Marchesa designer Georgina Chapman, who wore a dress of her own design. Frazer HarrisonSalma HayekHayek opted for a midnight blue velvet gown with gold embellished collar and gold skull box clutch by Alexander McQueen. Michael Buckner/GettyAdele“This dress weighs 15 kilos,” the “Skyfall” singer said of her black embroidered dress by Jenny Packham and Lorraine Schwartz jewels. For her performance of the song during the ceremony, she changed into a black dress with degradé hand-embroidered crystals by Burberry. Kevork Djansezian/GettyAlicia VikanderThe Anna Karenina star looked pretty in a blue embroidered dress by Elie Saab. Michael Buckner/GettyOlivia MunnThe actress looked ladylike in a red duchess satin strapless fishtail gown with hand-draped skirt and gold leaf embroidery by Marchesa. Frederic J. Brown/GettyJane Fonda Fonda was, perhaps, the brightest person on the red carpet in a canary yellow Versace dress. Frazer Harrison/GettyHelena Bonham CarterAlways marching to the beat of her own drum, Bonham Carter looked typically unique in a black and white Vivienne Westwood design. Kevork Djansezian/GettyMichael Douglas and Catherine Zeta-JonesZeta-Jones glittered in a gold beaded Zuhair Murad dress and Lorraine Schwartz jewels, while Douglas looked perfectly tailored in a tuxedo. Jason Merritt/GettyKristin ChenowethChenoweth, who was lively while manning the red carpet for ABC, looked stunning in a black tulle dress with silver embroidery.