In case you didn’t know (and really, why wouldn’t you?), today is Justin Bieber’s 19th birthday—surely a worldwide holiday in the bedrooms of tweenage girls. The pop star not only dominates the Billboard charts with his hit singles and albums, but he’s the man via social media as well. Not only does his nearly 36.2 million Twitter followers trump the amount of residents in his home country of Canada, he also recently beat out Lady Gaga with the most followers overall. A big chunk of the reason the Biebs runs the tweets is because he’s constantly Instagramming shots of himself through the site, often of him hanging out with celeb friends or just goofing off. To celebrate Justin’s b-day, Billboard thought it’d be cool to look back and yank 19 of his most memorable pics. Check him out, swaggin’ with Oprah, gettin’ dirty with the homies and letting a monkey pet him, amongst other young man foolery.