Some celebrities are modest enough to keep what's going on behind the camera to themselves, but some of them can't seem to get enough attention.

Instagram has always been a social media platform for celebrities and fans to share pictures and interact with one another. Some celebrities who are famous users of the photo sharing application is Rihanna, Justin Bieber, Beyonce, Kim Kardashian and a lot more.

On a constant basis, fans could get updates from these celebrities just by following them. Famous user Kim Kardashian is a serial Instagram poster, from posting a bunch of "selfies" she is also knows for sharing countless bikini snaps of herself. Sometimes referring to these pictures as "throwback Thursday" ones.

Another user who might have abused her Instagram account is Rihanna. She hasn't posted anything that can be classifies as X-rated but she definitely has a thing for sharing provocative pictures. She has posted a lot of topless pictures as well as photos during her visits to strip clubs. There were several occasions when she had to delete a couple of photos that because they were offensive.

Pop superstar Justin Bieber is also considered an addict Instagram user. It was almost necessary for him to post pictures of his tattoos or shirtless snaps of himself. It looks like he is determined to step out of his "Baby" image and present himself as a more "mature" performer. Well, good luck to him.

Browse through the gallery above to see more celebrity selfies.

Justin Bieber Kim Kardashian