Oscars 2012: 10 Biggest Style and Beauty Trends

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Super-Size Buns

Bigger was better for Shailene Woodley, Jennifer Lopez and Tina Fey, who sported major updos.

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Shades of Red

From Natalie Portman's scarlet vintage Christian Dior, to Michelle Williams' coral Louis Vuitton and Emma Stone's cherry Giambattista Valli, red was the only bold color that made a repeat appearance.

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Red Lips

Angelina Jolie, Rooney Mara and Milla Jovovich added a major dose of color -- and glamour -- to their look with classic red lips.

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Asymmetric Sleeves

Kata Mara (in Jack Guisso Couture), Sarah Hyland (in Alberta Feretti) and Stacy Keibler (in Marchesa) opted for dresses with a single draped sleeve.

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Diamond Chokers

Short diamond dazzlers were the bling of choice for Michelle Williams (in Fred Leighton for Forevermark), Cameron Diaz (in Tiffany & Co.) and Penelope Cruz (in Chopard).

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Black Nails

Instead of playing it safe with pale pink or classic red polish, Kristen Wiig and Sandra Bullock donned edgy, dark manis.

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Peplum Skirts

Tina Fey (in Carolina Herrera) and Michelle Williams (in Louis Vuitton) rocked one of spring's chicest fashion trends.

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Dramatic Bangs

Fierce fringe! Rose Byrne, Rooney Mara and Ellie Kemper took a hair risk with heavy, blunt bangs.

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Metallic Accents

Sparkly gold and silver detail gave Jessica Chastain's strapless Alexander McQueen, Judy Greer's graphic Monique Lhuillier, and Sandra Bullock's short-sleeve Marchesa a glam upgrade.