We have hunted down stunning options, ranging from Asos to Warehouse — take your pick! Combining risqué cut-outs with sequin fringing, this mini couldn't have been more fitting for the glamorous event.
Eilish added a bit of drama to her edgy silhouette by letting a black faux fur coat hang off her shoulders as she posed.
She performed a song from The Nightmare Before over the weekend alongside its creator Danny Elfman.