Ok, we knew this outfit looked familiar.

Hailey Bieber Repeated an Old Halloween Costume On Her Birthday
Credit: haileybieber/Instagram

Hailey Bieber turned 24 over the weekend, but before she officially celebrated the milestone while wearing a sexy, skin-baring Saint Laurent dress, the model pulled another daring style move — one we immediately recognized from years past. Stepping out in LA on Friday, she broke out some classics: a polka-dot printed top, a leather jacket, a bold belt, and black heels. But, the piece that truly took Bieber's outfit to the next level, and also reminded us of Sandy from Grease? Her tight, black, latex bottoms, a trend that she and Kylie Jenner have been loving as of late.

The outfit immediately brought back memories of Bieber's Sandy from Grease Halloween costume from a few years ago. While she skipped the crop top and went for a less literal interpretation, her shiny Saint Laurent leggings still gave us similar vibes as when she dressed as the iconic character.

Hailey Bieber Repeated an Old Halloween Costume On Her Birthday
Credit: Getty Images

Hey, when it works, it works. We, too, have found plenty of outfit inspiration from well-known movies.

We were also excited to see Bieber living by our new favorite fashion rule: wear what you want, even if you're just staying home. On Sunday night, when the star took to Instagram to show off her cutout birthday dress, she made sure to inform her followers that she was "all dressed up, nowhere to be" — a smart motto to live by during a pandemic.

We'll definitely keep these two fashion tricks in mind ahead of the holidays and beyond.