Sean Penn has officially started using Instagram! The actor is just one of the feeds to join an ever-growing list of famous faces using the social networking app to take cool snaps and videos of their various adventures. Take a look at our roundup of the top celebrities to follow on the social media site, and follow away, so you don't miss any exciting updates!
Click through to see who we're following, and once you're signed up, be sure to find our account and stay connected with POPSUGAR on Instagram. Happy sharing!