Access Hollywood Picks The Best & Worst Dressed Oscar Stars

1. Best Dressed Star - Katherine Heigl dazzled in crimson Escada, paired with a Jimmy Choo clutch and heels. She worked two of the big trends - a one shouldered gown and the color red, which dominated the red carpet.

2. Renee Zellweger - sparkled in a shimmery silver hand embroidered gown by her go-to designer- Carolina Herrera.

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3. French actress Marion Cotillard can add an Access Hollywood Best Dressed award to her Oscar win. She stunned in her custom made Jean Paul Gaultier white mermaid gown. Tres chic!

4. Penelope Cruz radiated old Hollywood glamour in her feathered navy Chanel Haute Couture organza gown, designed especially for her by Karl Lagerfeld.

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5. Heidi Klum also worked the red dress trend, accessorizing her John Galliano for Dior gown with a major beehive bun. She joked that she hid her blackberry and some snacks in there for when she gets hungry!

And special honors go to Nicole Kidman in Balenciaga, Jessica Alba in Marchesa and Cate Blanchett in Dries Van Noten. These three pregnant stars deserve a shout out - they all looked beautiful.

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As for the worst dressed - Helen Mirren's custom red duchess satin Georges Chakra gown was OK… but the Swarovski crystal sleeves look like they were attached as an afterthought.

And I am still scratching my head over Julie Christie, who accessorized her gown with long pink gloves that went up past her elbows. Tilda Swinton may have won Oscar Gold, but her unflattering black Lanvin sack dress was not a winner. In fact, it looked like a garbage bag. Throw this one out in the trash.

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