WORST: Hilary Swank was too sexy for this party! The Academy Award winner shocked in dramatically low-cut Armani Prive floorlength.

WORST: Joan Collins took the exaggerated shoulders look a little too far, with this white cocktail coat.

BEST: Patricia Clarkson looked flapper fantastic in a beaded number.

BEST: Anna Paquin definitely didn’t excite in her somewhat boring, Roland Mouret LBD, but she managed to jazz it up a little Lanvin gold chain necklaces from the Spring 2010 collection.

BEST: Why change when your dress is fab as can be? Kristen Stewart hit the Vanity Fair party in her gorgeously goth Monique Lhuillier.

BEST: Bar Refaeli looked white hot in a simply elegant, spaghetti-strapped gown.

BEST: Jessica Simpson looked understated in a black one-shouldered Carolina Herrera gown, which featured a Neil Lane diamond and platinum brooch.

WORST: Cameron Diaz shimmered in a metallic, belted mini, which failed to do much for her.

BEST: Katy Perry was beyond smoking hot, in a red and nude, Zuhair Murad beaded floorlength.

WORST: Charlize Theron left on her lavender Christian Dior for the afterparty. Still can’t get past the rosettes!

BEST: Abbie Cornish looked gorgeous in an embellished halter, wearing Neil Lane diamond and platinum earrings and bracelet.

BEST: Amanda Seyfried’s two-toned green mini looked gorgeous against her skin.

BEST: Amy Adams looked maternally chic in a navy blue gown.

BEST: Angie Harmon stunned in a pink, color-fading Oscar de la Renta strapless from the Pre-Fall 2010 Collection.

BEST: Julianne Moore changed into a simple, shimmery white strapless, which really stunned.

BEST/WORST: Mario Bello rocked a white, embellished mini, which featured a featured hemlines, which was gorgeous, but seemed a little too young for her.

BEST: Marissa Tomei wore a navy and black number, which featured a wide band belt.

BEST/WORST: It’s not awful, but Natalie Portman could have done better than this gunmetal mini.

BEST: Rosario Dawson rocked a fuchsia one-shouldered gown, which really brought our her beauty.

WORST: There is a time and place for fishnet tights, and the Oscars isn’t it, Sarah Silverman!

WORST: The worst part of Selma Blair’s confusing ensemble, was the miserable look on her face.

WORST: Salma Hayek was the only celeb to wear Alexander McQueen this year, but opted for the wrong dress. The neutral color palate washed her out and the exaggerated hips paired with the high neckline, just didn’t really impress.

BEST: WOW. Serena Williams showed off her athletically perfect body in a pink, cutout strapless, which was absolutely breathtaking.

WORST: Shaun White was lucky enough to get invited to the most exclusive party of the year, and he had to wear American flag pants. We get it. You won a gold medal. Now hire a stylist!

BEST: Vanessa Hudgens looked tres sexy in a dramatically low-cut Jenny Packham dress.

BEST: Jennifer Lopez changed into a black, cutout gown, which was WAY more flattering on her and really brought out her true diva self.

WORST: Eh….Kate Beckinsale’s metallic one-shouldered gown was a tad too shiny and liquid looking.

BEST: Kate Bosworth opted for a gorgeously hued, ruffled floorlength by.

WORST: Anna Kendrick is too young and gorgeous to cover up her chest in lace like that. The Up in the Air actress opted for another Elie Saab, adding nude Sergio Rossi heels.

WORST: Diane Kruger is one the hautest thangs on the red carpet, but this red thing? The gorgeous actress hopped onto the “exposed bra” trend wagon, wearing a sheer sheath with metallic heels.

BEST: Dianna Agron looked breathtaking in a white floorlength, which featured a fitted bodice which was embellished in a Bohochic sort of way.

BEST: Gabrielle Union should wear yellow every day. Seriously. This bright floorlength looked hopelessly gorgeous on her.

WORST: Lily Collins picked the wrong Chanel Spring 2010 dress, which was unflattering in every way possible. Love the white clutch, though.

BEST: Demi Lovato looked sexy in a simple, metallic bandage dress.

BEST: Jennifer Hudson looked dreamy in a cobalt blue number.

BEST: Bradley Cooper defined dapper in his sassy tux. How much hotter can he be?

BEST: Though she usually fights the power, Amber Rose finally surrendered to the Best Dressed list, looking smashing in a pink strapless. Love the heart-shaped clutch.

BEST: Olivia Wilde was a vision of timeless beauty and glamour. Adding a red clutch and peep-toed heels to her whispery, cream dress, proved that she is definitely on top of the fashion game.