Trending: Celebs on Instagram

If you're an iPhone user, you might be familiar with Instagram; the photo-sharing social media app that is sweeping the world. Why is it so popular? Instagram allows users to apply "filters" to their iPhone photos which adds interest and fun color effects that make them even more engaging to look at and share.

Celebs are even catching on to the Instagram craze: two of the most popular users on the app are none other than Justin Bieber and Selena Gomez - Couple Alert! Here are some of the snaps you can expect to see from them: 

Adorbz! If you want to follow these cuties, their usernames are JustinBieber and SelenaGomez, easy-peasy! Other Instagram accounts worth checking out include Snoop Dogg, and Ryan Seacrest (he posts photos of all the celebrities he meets daily).