The Fabulous Fashions of The 2012 MET Gala

Lily Collins was every bit the princess in this ethereal Valentino Spring 2012 Couture gown. 

Leighton Meester was marvelous in Marchesa.

Kristen Wiig looked fabulous in a trendy orange Stella McCartney gown.

Kirsten Dunst was a surprise in this menswear-inspired Rodarte dress.

Kate Upton showed she could do high-fashion in this slinky Michael Kors dress.

Hilary Swank showed some shoulder in this dramatic Michael Kors halter dress.

Heidi Klum showed some leg in this Escada Chantilly-lace slip dress.

Gisele flaunted her supermodel physique in this sparkly Givenchy gown.

Dakota Fanning looks all grown up in a full-length, pale gray Louis Vuitton gown. 

ET's Nancy O'Dell hits the carpet in a fiery red Zac Posen gown.

Ivanka Trump debuts her new bangs with a figure-hugging, dark blue gown.

Brooke Shields rocks a cane with her gorgeous, one-shoulder gown.

The Mission Impossible star wows in a soft pink, floor-length stunner.

Camilla Belle channels old Hollywood glamour in a silver, body-hugging dress by Ralph Lauren.

Hunger Games actress Elizabeth Banks hits the carpet in a daring Mary Katrantzou number.

Sarah Jessica Parker was all covered-up in this long-sleeved floral-print Valentino Couture gown.

Gwyneth Paltrow shows off her lovely legs in a barely there, metallic Prada minidress. 

Dianna Agron goes Grecian in a bold Carolina Herrera number. 

The Great Gatsby star and gala co-host dazzles in a knee-length, metallic Prada dress.

Marion Cotillard dazzled in Dior.

Parks & Rec's Amy Poehler goes goth in a strapless, black Fotini dress.

Florence Welch was the most talked-about of the night in this eye-popping Alexander McQueen gown.

January Jones was stunning in this bright yellow Atelier Versace gown.

Jessica Alba was a goddess in this gold Michael Kors gown, which she paired with dramatic dark lipstick.

Rooney Mara went predictably dark in this black Givenchy Couture gown.

Glee star Lea Michele dares to bare in Diane von Furstenberg. 

Jessica Chastain played it safe in this blue Louis Vuitton gown.

Jessica Biel was all bangs in this elegant Prada dress.

Vampire Diaries star Nina Dobrev sports a lengthy train on her multi-colored Donna Karan gown.

Vogue's editor in chief dons head-to-toe Prada alongside daughter Bee who opts for a floral, midnight-blue Erdem gown.

Sofia Vergara's body looked better than ever in this figure-flattering Marchesa gown.

Claire Danes wasn't afraid to show some skin in a low-cut J. Mendel dress.

Julianne Hough flashed her signature smile in this gorgeous fuchsia Carolina Herrera gown.

Emily Blunt rocked a pretty pink Calvin Klein cut-out gown next to a dapper-looking John Krasinski.

Eva Mendes was playful in Prada.

The Amazing Spiderman's Emma Stone pops in a knee-skimming, red Lanvin dress.

Cameron Diaz sparkles in a sparkly, silver number by Stella McCartney.  

Kristen Stewart rocks a multi-patterned design by Nicolas Ghesquiere for Balenciaga. 

Rihanna rocked a fierce 'do with her skin-tight Tom Ford gown. 

Renee Zellweger looked every bit the movie star in this sheer black Emilio Pucci gown.

Scarlett Johansson certainly brought the drama in this Dolce & Gabbana nude number with a dramatic tulle skirt.

Beyonce flaunts her enviable, post-baby figure in a feathered Givenchy Haute Couture gown. 

The biggest stars of stage, screen and runway took to NYC tonight to attend The Metropolitan Museum of Art's annual Costume Institute Gala, honoring designers Muccia Prada and the late Elsa Schiaparelli. Click through our gallery for all the fierce and fabulous fashions!