Best Dressed at the Oscars

The Best Actress nominee for Volver goes for all-out drama in an elaborate blush Atelier Versace gown with a sweeping train, and topped with a Swarovski clutch and Chopard diamonds.

The Best Supporting Actress nominee is a vision in a shimmering silver crystal-mesh Giorgio Armani Privé gown, topped with a tulle beaded floral overlay and Lorraine Schwartz diamonds.

Last year's Best Actress winner – who's presenting this year – is sleeker and sexier than ever in a strapless, tiered Nina Ricci gown, a 38 carat Van Cleef and Arpels diamond bracelet and long straight locks.

The presenter channels '60s-era glamour girls in her crystal-encrusted lilac silk Marchesa gown, Lorraine Schwartz diamond earrings and pinned-up curls.

Nominated for Best Actress for Little Children, the actress is effortlessly glam in a pale green, one-shouldered Valentino gown, set off by Chopard yellow diamonds and 18-karat gold Bulgari clutch.

The Oscar winner, who presented this year, lets her hair down with flowing straight locks – and a sizzling apricot tulle-and-chiffon Zac Posen gown.

Last year's Best Supporting Actress winner is the epitome of elegance in a platinum satin Vera Wang gown, accessorized with a softly curled updo and a dazzling diamond vintage Cartier pendant.

All hail The Queen! The Best Actress winner blooms in a floral print Christian Lacroix gown topped with embroidered lace, the Lana Marks Cleopatra clutch and, in back, a jaw-dropping 62-carat Chopard diamond brooch.

The presenter described her raspberry Oscar de la Renta gown as "comfortable and chic"– we'd say simply stunning is more like it.

Fresh off a beach vacation, the presenter glows in an off-the-shoulder white satin Valentino gown and a whopping $2.9 million worth of Cartier jewelry.

Before performing during the show, the Dreamgirl rocks the red carpet in a crystal-adorned one-strap Armani Privé gown and Lorraine Schwartz jewels.

The presenter shows off her post-baby body in a crystal-embroidered navy Proenza Schouler gown with a one-strap neckline and feather-trimmed hem.

Putting aside her riskier fashion choices, the Best Supporting Actress nominee goes for old Hollywood glamour in a black sequined fishtail gown with Chanel Haute Couture and Chanel jewels.

Supporting her fiancé, Sacha Baron Cohen (a.k.a. Borat), the actress sets off her red hair with an emerald green satin corset gown from Monique Lhuillier's fall collection and a Lauren Merkin clutch.

While Best Actor nominee husband Will and son Jaden presented, the actress is content to steal the show on the red carpet in a yellow Carolina Herrera gown and H.Stern jewels.

The presenter glows in a buttercup-yellow Escada gown, dazzling Chopard diamonds and retro waves.

The actress must have paid close attention on the set of The Devil Wears Prada: The presenter looks simply stunning in an inky-blue sequined Calvin Klein gown, Lana Marks clutch and H.Stern jewels.

Ever the risk-taker, the presenter tops off her slim crimson silk crepe Balenciaga column dress with an oversized bow and a custom L'Wren Scott diamond bracelet.

The Best Supporting Actress winner goes for the gold with her python cropped jacket over an Oscar de la Renta chocolate chiffon gown and Fred Leighton diamonds.