Stars Who Love Zac Posen

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Amanda Seyfried

Navy knockout! The Les Miserables actress stunned at the 2013 Screen Actors Guild Award in Posen's fishtail gown.

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Naomi Watts

The Impossible nominee confidently wore the designer's bordeaux satin crepe gown at the 2013 Golden Globes.

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Jessica Chastain

The Zero Dark Thirty actress has Posen to thank for providing one of her favorite red carpet memories. "The Zac Posen dress on the red carpet at Cannes [is my favorite look I've worn]! I wanted to wear a dress that looked like sunshine," Chastain tells Us. "Holding hands with Sean Penn and Brad Pitt while wearing that yellow dress is a moment I'll never forget."

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January Jones

The Mad Men actress chose Posen's voluminous, high-low gown for the 2012 Emmys.

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Rosario Dawson

She wore Posen to mingle with the President! The actress chose the Project Runway judge's emerald green design for the 2012 White House Correspondents Dinner in Washington, D.C.

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Reese Witherspoon

Witherspoon was ravishing in Posen's form-fitting peony taffeta bustier gown at the 2012 Golden Globes.

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Rihanna

The singer hit a high note with her 2008 Grammy dress: Posen's cobalt blue feather-trimmed design.

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Anna Kendrick

Pitch Perfect's Kendrick was fun and flirty at the 2010 MTV Movie Awards in the designer's floral watercolor wrap dress.

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Coco Rocha

With the designer on her arm, The Face's Rocha wowed in a maroon one-shoulder gown at the 111th Anniversary of Bergdorf Goodman in NYC.

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Kiernan Shipka

"I met up with Zac in New York at his atelier and I told him my ideas of what I wanted it to be," the Mad Men actress told InStyle.com of her search for the perfect 2012 Emmy dress. "He had this whole vision. He's brilliant. He came up with two sketches and I chose this."

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Jessica Biel

Mrs. Justin Timberlake sizzled in Posen's cream-and-gold jacquard bustier dress at the Dublin premiere of Total Recall in 2012.

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Kate Beckinsale

The Total Recall actress promoted her flick in Berlin wearing Posen's purple long sleeve dress.

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Lea Michele

Glee's Michele was all smiles at the 2012 Glamour Women of the Year Awards in Posen's backless navy gown.

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Lily Collins

Mirror, Mirror on the wall, who is the most fashionable of them all? Collins wowed in Posen's forest-green floral-print jacquard strapless gown at the Paris premiere of her film.

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Glenn Close

In a forest green strapless Zac Posen gown and matching blazer, Close dazzled at the 2012 Oscars.

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Amber Heard

Heard showed just the right amount of skin at the 2012 Screen Actors Guild awards in this black cut-out design.

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Elle Macpherson

The model showed off Posen's intricate ivory fishtail tulle gown at the 2012 Golden Globe Awards.

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Emma Roberts

At the 2012 InStyle Golden Globe Awards Party, the actress dazzled in Posen's navy ruched gown.

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Iman

The model turned heads in Posen's scarlet gown at the 2011 opening night gala for Alvin Ailey's American Dance Theater.