Victoria Beckham
With David off playing soccer in Milan, Posh is charged with bringing the sexy all on her own in this one-shouldered polka-dot number by Louis Vuitton. It also meant she had to bring double the tan.
Madonna
That horse accident and adoption drama must have taken their toll on the queen of pop. She appears to have no idea she's wearing thigh-high boots, bunny ears and a tiny ruffled Louis Vuitton dress.
Rihanna
It's been three months since we've seen Rihanna make a public appearance, and she sure knows how to make a dramatic return, as proven by this cartoonish Dolce & Gabbana tuxedo.
Blake Lively
The Gossip Girl star picked out this teal Versace dress while perusing photos on Style.com. It was the perfect thing to show off both cleavage and thigh.
Anne Hathaway
With "go big or go home" hair, the actress dons this voluminous eggplant strapless dress by Marc Jacobs and strappy metallic sandals by Pour La Victoire.
Cindy Crawford
Once a supermodel, always a supermodel, which means no aging, which then means she can still wear Versace dresses fit for a 21-year-old Gossip Girl star.
Marion Cotillard
Always the epitome of red-carpet perfection, the Oscar-winning French actress glows in this nude strapless Christian Dior gown.
Jessica Alba
While everyone else is showing off some leg, Jessica Alba opts for black tights (why?!) under her cobalt-blue Jason Wu mini with embellished bodice.
Kirsten Dunst
That coy little smile makes us wonder if Kiki actually believes she's pulling off this busy, granny-chic Chanel dress.
Leighton Meester
Between the trippy pantsuit, cutesy ringlets and bright-pink cheeks, Gossip Girl’s reigning queen looks like a psychedelic doll.
Tyra Banks
As always, Tyra shows everyone how to be a supermodel. It doesn't matter what crazy weave they put on her head, she'll still rock that Badgley Mischka gown and smile with her eyes.
Ashley Olsen
The cowl back on this simple and chic white-hot dress offers the perfect opportunity to show off some posterior glitz. Only in Olsen land, kids.
Mary-Kate Olsen
Where Ashley goes classic, M.K. goes crazy quirky. She keeps her witch vibe going in this Christian Lacroix Haute Couture vintage gown that leaves no texture unturned. Metallic lace, gray pleated chiffon, ruffled skirt, silver-embroidered bustier—this dress has it all.
Marc Jacobs & Kate Moss
The iconic supermodel goes all the way with gold lamé in an asymmetrical dress and heels by the designer on her arm, along with an unexpected turban by milliner Stephen Jones.
Katy Perry
Of her cobalt-blue Tommy Hilfiger design, the "I Kissed a Girl" singer said, "I feel like Cleopatra." We'll have to agree with her on this one.
Emma Roberts
Julia Roberts' niece tries her hardest to make this little Atelier Versace dress work for her, but this is a design that requires some serious attitude.
Rachel Bilson
The O.C. actress looks ready for a regular night on the town in this straightforward teal mini by Bally.
Eva Mendes
Shining in Calvin Klein, the actress accents the metallic sheath with emerald jewels.
Justin Timberlake & Jessica Biel
Supporting her William Rast-clad man (who shared the honor of benefit cochair with Marc Jacobs and Kate Moss), Jess wears a stunning and vibrant design by Atelier Versace.
Renée Zellweger
Would we expect anything else but a Carolina Herrera gown from Ms. Zellweger? Maybe we couldn't predict the forest-green striped cloque corset details, but we can always count on Carolina.
Heidi Klum
The supermodel hides her baby bump under the navy blue layers of this J. Mendel gown.