Met Costume Gala: What's Her Best Dress?

The Metropolitan Costume Institute Gala is to the fashion industry what the Academy Awards is to Hollywood. And the celebrities know to turn it out on the red carpet in some seriously show-stopping designer creations.

And while it's a big deal to get invited to the A-list affair even once, some stars have been lucky enough to attend several times.

PHOTOS: What's her best Met Gala dress?

For her first appearance in 2004, Scarlett Johansson chose one of her best looks to date: a bright yellow Calvin Klein gown with a cleavage-enhancing push-up neckline. Four years later, the then newly engaged actress wore a champagne strapless Dolce & Gabbana dress with a corset top and tulle skirt in 2008.

PHOTOS: ScarJo's romantic history

Never one to play it safe with her fashion choices, Rihanna rocked a daring Dolce & Gabbana tuxedo with puffy shoulders in 2009 and a skin-tight lace Stella McCartney dress (and Rapunzel-length red braid) in 2011.

Rihanna at The Metropolitan Museum of Art Costume Institute Spring Benefit Gala in 2009 and 2011.
Credit: Kevin Mazur/WireImage.com; Dimitrios Kambouris/FilmMagic

PHOTOS: Met Gala 2011: What all the stars wore

Click through the gallery to see more stars at the Met Costume Gala and vote for their best look!