Kim Kardashian's little sisters sure hit the town a lot for being underage!

Kylie and Kendall Jenner spent Halloween weekend partying it up with Tyga and Cara Delevingne, and while the models' friendship makes total sense, we're still not sure what to think about Kylie and the rapper's rumored romance. It certainly looks like they aren't trying to hide their relationship status anymore, considering they went in couple's coordinated costumes!

The hip hop star dressed up as Chucky, while the 17-year-old went as the Bride of Chucky. Funny part is, we couldn't even tell the reality star wasn't wearing her everyday makeup and attire! As if people weren't talking enough about Kylie's lips, she gave people more topics to discuss with her enhanced chest!

The cat walkers, meanwhile, went as Mario and Luigi and looked hilarious!