And a super tiny tank.
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Hailey Bieber YSL Pre-Oscar Party Sheer Pants

Out of all the pre-Oscar parties leading up this year's Academy Awards, Saint Laurent's soiree arguably had the best-dressed guest list. From Zoë Kravitz's sheer one-shoulder top to Maude Apatow in a two-tone blazer dress and cobalt blue gloves straight off the runway, there was no shortage of cool girls and even cooler looks. But the winning outfit of the evening had to go to Hailey Bieber.

Bieber arrived to the event dressed in a cropped black leather jacket with a tiny white tank top underneath. The lower half of her outfit, though, is what really stood out. On the bottom, Hailey wore sheer black lace trousers that exposed her high-waisted briefs and supermodel long legs. Pointed-toe black pumps with crystal detailing on the toes and nighttime sunglasses provided the finishing touches to her look.

Her "expensive brunette" tresses were styled straight, while her bronzed skin was complemented by a pink glossy lip.

The next day, Hailey shared a behind-the-scenes look of her getting ready for the party on Instagram. "last night @ysl 🖤," she captioned a slideshow of snapshots and clips posted to her grid, including one of her racy outfit from behind and a video that showed her applying lip liner in the mirror.