We've said it before and we'll say it again: the classic LBD will always reign supreme. And while we certainly don't need additional proof to authenticate the above statement, Hailey Bieber's latest

On Monday night, Hailey and Justin Bieber attended the Royal Opera House in London, England for a performance of The Nutcracker. Naturally, they both dressed for the holiday occasion, with Justin choosing to wear head-to-toe Balenciaga, including a gray, plaid suit and chunky sneakers, and Hailey showing off an itty-bitty black minidress from Acne Studios. The dress, from the Swedish brand's F/W 21 collection, featured two front, jet pockets, a tailored bodice, and exaggerated shoulders. Though quite nearly sold out, Bieber's exact style is still available in select sizes. In other words, shop it before it's too late.

Adding to the classic look, the model wore a pair of sleek, black Wolford tights and matching pumps from Saint Laurent's S/S 22 collection. Keep scrolling to see her entire look for the couple's (date) night at the Opera.