It looked like quite the soiree!

Kendall Jenner hosted a Halloween birthday bash at Delilah nightclub in West Hollywood last night, and the supermodel sexed it up in a green bra to be Buttercup from The Powerpuff Girls. That's a random costume!

She brought out a bunch of big names, including sister Kourtney Kardashian and her boyfriend Younes Bendjima, Hailey Baldwin, and G-Eazy and his girlfriend Halsey.

Where was her boyfriend Blake Griffin, though? The two are officially a couple, but it looks like he stayed home to trick-or-treat with his kids.

Normally Kylie and Khloe would have been in attendance, but they're too busy hiding out and being pregnant!