The stunner, who has a figure to die for, slipped into this eye-popping all-in-one jumpsuit at the glitzy bash which gave us all a bit more than we bargained for thanks to the sheer lace bottoms - and can we just take a second to marvel over those 70s flares?
Em's high waisted undies were visible under the trousers but that's not all she flashed - oh no.
The super-confident star who appears in film We Are Your Friends alongside actor hunk Zac Efron, flaunted her assets in the boob-baring, zip up top and drew attention to them with a contrasting, chunky orange belt that emphasised her wasp waist.
Emily let her rather unusual but oh-so-cool sartorial choice do all of the dazzling and channelled her inner boho chick with soft waves, bronzer and a subtle pink gloss. Perfect!
Standing tall against fellow actress Amanda Seyfried and Kevin Jonas' wife, Danielle, Emily teamed her look with pointed courts and a metallic boxy clutch bag as she sipped on champagne and had a natter with her celeb pals.
It's official - she could make a bin liner look like couture.
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