Read Kourtney Kardashian's birthday message to Kylie Jenner which many say is inappropriate and offensive

Kourtney Kardashian took to Instagram to wish her kid sister, Kylie Jenner a happy birthday, but social media users feel the message is inappropriate.

Sharing a photo of the entire Kardashian/Jenner sisters and their mother giving the middle finger, Kourtney wrote: "happy fucking birthday bitch."