For a look at the top ten best dressed celebs of the night, check out the gallery below.
Images: Getty
2015 SAG Best Dressed
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Lupita Nyong'o
It's hard to top Lupita's jaw-dropping teal Gucci dress from last year, but if any gown has a chance, it's this printed Elie Saab number.
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Felicity Jones
If Felicity's performance as Stephen Hawking's wife in The Theory of Everything didn't capture your attention, the British actress' off-the-shoulder Balenciaga gown will.
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Sofia Vergara
Love has been good to the Modern Family vixen, who slipped into a red Donna Karan Atelier gown for her first red carpet appearance with fiancé Joe Manganiello since getting engaged at the end of 2014.
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Emma Stone
This risky Dior Haute Couture could have made the worst dressed list on another starlet, but Emma Stone has a knack for pulling off red carpet gowns better than the average actress.
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Reese Witherspoon
Reese Witherspoon recently roughed it in the wild for her latest role, but the 38-year-old nominee was back in tip-top form, thanks to a minimalistic white custom gown by Giorgio Armani.
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Julianne Moore
When you select Givenchy for the Golden Globes, it's a look. But when you wear the label again at the SAG Awards just weeks later, it's a statement.
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Julia Roberts
Julia Roberts may be the only actress so far that's pulled off a jumpsuit two consecutive years at the SAG Awards—first with a pink Valentino in 2014 and now with a plunging tuxedo design by Givenchy.
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Natalie Dormer
What a difference a year makes. After last season's half-shaved hair fiasco, Natalie stepped up her style game in a watercolor floral Naeem Khan gown.
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Keira Knightley
Keira's pregnancy style has been anything but conventional. A tiered, purple lace Erdem gown is the perfect punctuation in a long line of bold choices.
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Julianna Margulies
The Good Wife actress knows her way around a great suit set, but courtroom clothes pale next to the drama of a gown by Giambattista Valli.