Kylie Jenner's 21st Birthday Had a Color-Coded Drink System — and It's a Brilliant Icebreaker

Kylie Jenner's wild 21st birthday party on Thursday night had a barfing Barbie cake, an adult ball pit, both her parents, and a blinding number of sequins — and all the revelry was fueled by a rather brilliant icebreaker of a drink system. (Take notes — this idea is definitely worth stealing for your next party.)

Guests were greeted at the bar with a sign explaining that if you are taken, you should grab a pink cup; if you're "single AF," take a yellow cup; and if "it's complicated," drink out of a green one.

It's a simple and playful idea that can take a whole lot of guesswork out of a room pretty quickly — and eliminate unwanted advances by both parties — right? (Plus, it's definitely Kim Zolciak-Biermann approved.) No wonder Kylie's an almost-billionaire.

Sister Khloe Kardashian snapped a pic of her friend Malika Haqq, who apparently has a little complication going on in her life right now.

Good lookin' out, Kylie!

Photos: Kylie Jenner/Instagram and Khloe Kardashian/Instagram