Last night's W Magazine Best Performances party could have very well been honoring the best performances in fashion, not film. This Hollywood crowd brought out a chic collection of cocktail dresses — and even a jumpsuit or two — for the Golden Globes preparty. Sure, it's a little more dressed down than we might see on Sunday, but we promise the looks from Lupita Nyong'o, Amy Adams [1], and the rest of this all-star pack are just as stunning.

Olivia Wilde

The actress showed off her bump in a fitted Gucci minidress with a leather jacket, which she finished with Brian Atwood heels and a pair of Jennifer Meyer earrings.

Molly Sims

Molly slipped into a red-and-nude slip dress with a flirty '20s vibe.

Lupita Nyong'o

The 12 Years a Slave breakout star showed her fashion chops [2] in a cutout and crisscrossed black Proenza Schouler cocktail dress, which she accented with a chic white clutch in hand.

Kirsten Dunst

Kirsten posed alongside Garrett Hedlund in a graphic Rodarte midi dress and ankle boots.

Sofia Vergara

The Modern Family knockout opted for a lacy, long-sleeved mini to show off her stems.

Michelle Dockery

Downton Abbey's star brought the color in a bright Altuzarra sheath and yellow Christian Louboutins.

Marisa Tomei

Marisa Tomei took the casual-cool approach in a bright blouse and leather trousers.

Amy Adams

Amy Adams [3] ditched her American Hustle vibe [4] in favor of a sophisticated blazer-style dress and nude pumps.

Amber Valletta

The model stepped out in a chic black jumpsuit with a gold necklace and coordinating Louboutins to finish it all off.

Cate Blanchett

Cate Blanchett [5] topped an easy black jumpsuit with a statement necklace and completed the look with black booties.

Allison Williams

Ever the fashion darling, Allison opted for a sleek, belted black v-neck sheath dress from Calvin Klein Collection and understated heels.

Ashley Madekwe

The style-savvy star accented her striped black-and-white dress with a bold red lip and a pair of metallic Louboutins.

Dita Von Teese

Dita Von Teese [6] went for the drama in a gold-tinged floral gown and tassel-drop earrings.

Sarah Hyland

Sarah Hyland finished her bold orange look with an exotic, multicolored clutch and strappy sandals.

Naomie Harris

Naomie wowed in a white, textural Marni mini and a pair of black sandals, which she accessorized with a Delfina Delettrez ring.