Kylie Jenner celebrates 21st birthday by flipping the bird to her Instagram followers

When a member of the Kardashian-Jenner family has a birthday, low-key isn't exactly the word we'd use to describe their celebration.

True to form, Kylie Jenner's 21st birthday was anything but low-key.

SEE ALSO: Dictionary.com didn't throw shade at Kylie Jenner. It actually made an important point.

Kylie posted a shot of herself with Kendall, Kim, Kourtney, Kris, and Khloe, in which they all put their middle finger up at the camera.

How rude. Happy birthday Kylie!