Justin Bieber

Marc Andrew Deley/FilmMagic; Hewitt/Splash News; Rocstar/Flameflynet

Happy birthday, Justin Bieber! Can you believe the singer is 19 years old?!

We've watched the superstar grow up in the public eye since he first burst on the scene as a young teen, and he continues to be one of the biggest and most buzzed-about names in the music biz.

Currently, J.B. is the most followed person on Twitter (sorry, Lady Gaga) and he's also the first artist in history to score five No. 1 albums all before the age of 19. No big deal. 

Find out how J.B. celebrated last night

Whether it's heartbreak or controversy, we feel like we've been with the Biebs through it, and we can't wait to see everything the talented pop star will surely accomplish in his future.

Last night, Justin kicked off his birthday celebration by showing off his buff bod on the streets of London, and he took to Twitter today to thank fans for the B-day wishes:

"Gonna be fun tonight. Thanks to everyone for all the birthday wishes. 19!," he wrote before adding, "#giveback today for my birthday" and letting fans know he has a "big night ahead."

So, because we can't help but notice the star is looking much bulkier than before, we've decided to share a bevy of Justin's shirtless shots, as we know the singer loves to strip down.

You're looking abs-olutely fabulous on your birthday, Biebs! 

Baby, baby, baby—oh!—Justin just gets better with age. 

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