Red carpet: Costume Institute Gala

Actress Carey Mulligan, wearing Prada, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Mad Men star January Jones, wearing Atelier Versace, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Actress Scarlett Johansson, wearing Dolce & Gabbana, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Actress Cameron Diaz, wearing Stella McCartney, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Beyonce, wearing Givenchy, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Actress Camille Belle, wearing Ralph Lauren, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Glee star Lea Michele, wearing Diane von Furstenberg, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Actress Emma Stone, wearing Lanvin, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Florence Welch of Florence and the Machine, wearing Alexander McQueen, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Singer Lana Del Rey, wearing Altuzarra, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Model Coco Rocha, wearing vintage Givenchy, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Anna Wintour, wearing Prada, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Mad Men star Jessica Paré attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Brooke Shields attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Parks and Recreation star Amy Poehler, wearing Fotini, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Dakota Fanning, wearing Louis Vuitton, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Gossip Girl star Ed Westwick attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.

Bianca Brandolini D'Adda, wearing Dolce & Gabbana, attends the Costume Institute Gala at the Metropolitan Museum of Art 2012 in New York.