The actress grabbed everyone's attention in the storm grey tulle frock designed by Chanel, which twinkled under the camera flashes thanks to the hundreds of diamantes adorning the front in a harlequin pattern.
Carey beat the likes of Helena Bonham-Carter and the legendary Meryl Streep to nab the award for best dressed in her show-stopper of a gown that boasted a ballerina style hem and matching fluted sleeves.
The star looked enviably slim on the red carpet - her first public appearance since giving birth - and praised domestic violence campaigners who flooded the premiere before setting off smoke bombs and flares.
She said, "I wish I'd seen it. For these women to do that tonight, I think that's awesome. It's so exciting."
Carey braved the London chill and teamed her lovely ensemble with a simple pair of strappy satin sandals. Her perfectly tousled locks and barely-there make-up lent the breathtaking dress a gorgeous, ethereal edge.
Girl crush alert!
Lovely Ms. Mulligan was all smiles as she posed patiently for the paparazzi before joining the rest of her Suffragette co-stars including Ramola Garal and Anne-Marie Duff for a very cute group photo.
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