kylie jenner 21st birthday
photo: @kyliejenner / Instagram

It's the end of an era in the Kardashian-Jenner universe, as the youngest member of the family is now legally allowed to drink alcohol. That's right — Kylie Jenner is finally 21!

Naturally, she rang in her birthday in the most KarJenner way possible: An epic party decked out in pink, with a star-studded guest list, and two positively extra Barbie-esque outfits. I mean, with a casual billion dollars at your disposal, wouldn't you do the same?

Kylie showed up to her birthday dinner in Los Angeles in a bright pink mini dress by Peter Dundas and was absolutely killing it.

She made it clear this was her night to shine.

Her sisters dressed to the nines as well — with Kim suspiciously matching the birthday girl in Barbie pink.

kim kardashian at kylies 21st birthday
photo: Pap Nation / Splashnews.com

This seems a little bit like wearing white to someone else's wedding, but that's none of my business.

Fellow new mama Khloé opted for a show-stopping glittery three piece.

Get it Khloe @kyliesnapchat

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Kourtney went with a sparkly candy purple mini dress.

kourtney kardashian at kylie jenners birthday
photo: Photographer Group / Splashnews.com

Kendall chose a black glittery strapless mini, which is totally on point for her.

Kendall Jenner at kylies 21st birthday
photo: Photographer Group / SplashNews.com

And momager Kris Jenner turned up in a sleek black suit, obviously.

A post shared by Kylie Jenner (@kyliesnapchat) on

The whole family nailed the "birthday behavior" vibe in one way or another with sparkles, mini dresses, and candy colors.

BIRTHDAY BEHAVIOR! WERE ALL TURNING 21!!

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To put it bluntly, they looked fierce AF.

a bunch of baddies ????????‍♀️ we’re 21 today

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"WE'RE ALL TURNING 21!" Kylie wrote in the caption.

A post shared by Kylie Jenner (@kyliesnapchat) on

But because this is an epic occasion in the KarJenner universe, Kylie had to make an epic outfit change. DUH.

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At some point in the night, Kylie broke out this blindingly-bright romper designed by Labourjoisie. According to the designer's Instagram, it was embellished with 70,000 Swarovski crystals. Super casual.

Here's the slow scroll of the outfit you never knew you needed.

A post shared by Kylie Jenner (@kyliesnapchat) on

Now THAT is a birthday suit.

Kylie's boyfriend and Stormi's father, Travis Scott, was by her side the entire night.

first legal drink???????

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And because the KarJenners throw the most glamorous birthday celebrations, the guest list was loaded with big names.

Kourtney’s ex Scott Disick was there, as well as Kris’ boyfriend Corey Gamble, Caitlyn’s friend Sophia Hutchins, Kendall’s ex Blake Griffin, Nicki Minaj, Winnie Harlow, Bella Hadid, The Weeknd and Dave Chapelle.

So, all in all, it seemed like the newly 21-year-old billionaire had a great night.

goodnight

A post shared by Kylie (@kyliejenner) on

Happy birthday, Kylie!