Literally Everyone Was at Gigi Hadid's Birthday Party Last Night

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What did you do last night? Chilled out at home? Met some friends at a bar? Medium Tinder date? Meanwhile, every other person in the entire world was at supermodel Gigi Hadid's birthday party.

At LA's The Nice Guy, otherwise known as celebrities' favorite place to avoid having to interact with regular people, the stars showed up to celebrate Gigi turning 21. The dress code? Show off either your legs or your abs — doesn't matter, just pick one — then add a choker.

Who was there, exactly? Hailey Baldwin was there, in a leotard, sheer dress, and a diamond choker:

Photo: Fame Flynet

Kylie Jenner was there, in a white three-piece:

Photo: Fame Flynet

Taylor Swift was there, in a sparkly high-low one-shoulder dress:

Photo: Fame Flynet

Lily Aldridge was there, in a simple black dress and '90s-esque platform sandals:

Photo: Fame Flynet

Kendall Jenner was there, wearing an embellished blazer, matching trousers, and this Anine Bing bralette:

Photo: Fame Flynet

The birthday girl was there, wearing birthday thigh-high lace-up sandals and this Rockins scarf:

Photo: Fame Flynet

Evan Ross, Shanina Shaik, and Ashlee Simpson (!?) were there:

Photo: Fame Flynet

Olivia Culpo was there, wearing this:

Photo: Fame Flynet

Naomi Campbell and Lenny Kravitz were there, having the best time ever:

Photo: Fame Flynet

Gigi's stepdad David Foster was there, not adhering to the dress code:

Photo: Fame Flynet

Most importantly of all, Gigi's mom Yolanda Foster was there:

Photo: Fame Flynet

Equally as important, those photo booths that make everyone look like beautiful greyscale alien version of themselves were there:

A photo posted by Lily Aldridge (@lilyaldridge) on Apr 28, 2016 at 10:57pm PDT

A photo posted by Taylor Swift (@taylorswift) on Apr 29, 2016 at 1:25am PDT

The Haim sisters were there:

A photo posted by Taylor Swift (@taylorswift) on Apr 29, 2016 at 1:32am PDT

Khloé and Kourtney Kardashian were there, along with Jaden Smith, who brought the world's most confusing hat:

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 29, 2016 at 1:02am PDT

And finally, this Snapchat of Hailey Baldwin telling Kendall Jenner she's "not that pretty" was there:

A video posted by Kylie Jenner Snapchats (@kylizzlesnapchats) on Apr 29, 2016 at 2:51am PDT