Oscars 2010: Best/Worst Style

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Sandra Bullock | SANDRA BULLOCK For her first Oscar nomination (and win!), it was only fitting that Bullock set a new standard for Hollywood glam in her golden — Rick Rowell/ABC

SANDRA BULLOCK
For her first Oscar nomination (and win!), it was only fitting that Bullock set a new standard for Hollywood glam in her golden Marchesa. Grade: A+

Gabourey Sidibe

Picking one of the most popular colors of the night, the Best Actress nominee shined in an off-the-shoulder Marchesa. Grade: A

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Kristen Stewart | KRISTEN STEWART In a delicately pleated Monique Lhuillier, Stewart, whose red-carpet looks have evolved from Converse to couture , passed with flying colors. Grade: A — Jeff Vespa/WireImage.com

KRISTEN STEWART
In a delicately pleated Monique Lhuillier, Stewart, whose red-carpet looks have evolved from Converse to couture, passed with flying colors. Grade: A

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RACHEL MCADAMS
Prints don't always play on the red carpet, but McAdams was a work of art in a watercolored Elie Saab gown. Grade: A

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Meryl Streep | What do you think of this look? ( polls ) — Jason Merritt/Getty Images

MERYL STREEP
She may have 16 Oscar nods under her belt, but Streep looked fresher than ever in this crisp white number, designed by Project Runway contestant Chris March. Grade: A

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Elizabeth Banks | ELIZABETH BANKS The host of last weekend's Scientific and Technical Awards was all ruffles and romance in dove grey Versace. Grade: A — Rick Rowell/ABC

ELIZABETH BANKS
The host of last weekend's Scientific and Technical Awards was all ruffles and romance in dove grey Versace. Grade: A

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Helen Mirren | HELEN MIRREN Proving herself (yet again) a fashion force to be reckoned with, the Best Actress nominee glittered in Badgley Mischka. Grade: A — Todd Williamson/FilmMagic.com

HELEN MIRREN
Proving herself (yet again) a fashion force to be reckoned with, the Best Actress nominee glittered in Badgley Mischka. Grade: A

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AMANDA SEYFRIED
What could've been an overwhelming ball gown was princess perfection for Seyfried, who floated down the carpet in her silver Armani Prive. Grade: A-

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Anna Kendrick | What do you think of this look? ( polls ) — Rick Rowell/ABC

ANNA KENDRICK
The subtle shade of Kendrick's Elie Saab gown let the dress's marvelous draping take the spotlight. Grade: B+

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Cameron Diaz | What do you think of this look? ( polls ) — Frazer Harrison/Getty Images

CAMERON DIAZ
The Oscars may be a serious affair, but Diaz added a welcome burst of sparkle in Oscar de la Renta and matching hoop earrings. Grade: B+

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Kate Winslet | What do you think of this look? ( polls ) — Jason Merritt/Getty Images

KATE WINSLET
Last year's Best Actress winner set off her understated silver Yves Saint Laurent dress with Titanic-worthy jewels that took center stage. Grade: B

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PENELOPE CRUZ
Though the Best Supporting Actress nominee's Donna Karan gown was a bit heavy on material, its rich crimson hue more than made up for it. Grade: B

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Carey Mulligan | CAREY MULLIGAN Box pleats and a mullet hem usually equal fashion disaster, but the first-time nominee managed to pull off her bejeweled Prada gown like — Kevin Mazur/WireImage.com

CAREY MULLIGAN
Box pleats and a mullet hem usually equal fashion disaster, but the first-time nominee managed to pull off her bejeweled Prada gown like a pro. Grade: B-

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Maggie Gyllenhaal | MAGGIE GYLLENHAAL We can appreciate Gyllenhaal's effort to throw something modern into the red-carpet mix, but her brushstroked Dries Van Noten dress looked more after — Jeff Kravitz/FilmMagic.com

MAGGIE GYLLENHAAL
We can appreciate Gyllenhaal's effort to throw something modern into the red-carpet mix, but her brushstroked Dries Van Noten dress looked more after party than Academy. Grade: B-

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CHARLIZE THERON
We were too concerned that Theron's Dior gown was trying to grope her to take in any other details like, say, its lovely pink hue. Grade: C

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Zoe Saldana | What do you think of this look? ( polls ) — Frazer Harrison/Getty Images

ZOE SALDANA
The top of the Avatar star's Givenchy gown said red-carpet star on the rise, while the bottom raised the question, ''Who wants to Can-Can?'' Grade: C

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Diane Kruger | What do you think of this look? ( polls ) — Jason Merritt/Getty Images

DIANE KRUGER
Yes, Kruger's Chanel halter gown was divided into three parts, but there was no harmony here. Grade: C-

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Miley Cyrus | What do you think of this look? ( polls ) — Frazer Harrison/Getty Images

MILEY CYRUS
Her dress last year was too big, and this year's Jenny Packham was too small. Here's hoping that in 2011 she gets it just right! Grade: C-

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Vera Farmiga | VERA FARMIGA The red carpet was full of ruffles, but, judging by her overwrought Marchesa, it looked like Farmiga wanted them all to herself. Grade: — Rick Rowell/ABC

VERA FARMIGA
The red carpet was full of ruffles, but, judging by her overwrought Marchesa, it looked like Farmiga wanted them all to herself. Grade: C-

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Jennifer Lopez | What do you think of this look? ( polls ) — Frazer Harrison/Getty Images

JENNIFER LOPEZ
We know that J.Lo is famous for her curves, did she really have to cover them in bubble wrap to keep them safe for the night? Grade: D