Kylie Jenner is single and ready to mingle!

The KUWTK star, 18, was spotted rocking some serious underboob during a girls' night out with sister Kendall Jenner.

Wearing a skin-tight, grey spandex jumpsuit with a huge cut-out under her breasts, the brunette beauty narrowly avoided a wardrobe malfunction while leaving Hollywood hot spot The Nice Guy.

We're sure Kylie, who just broke up with rapper Tyga, managed to make her ex jealous in this revealing ensemble!

For more celebs with unavoidable underboob, click through the slideshow!