Justin Bieber's 17th Birthday: From Usher's Protégé to Selena Gomez's Love?

Happy 17th Birthday, Justin Bieber! We have to say, the new haircut is definitely helping make him look a year older. At first, he was just a baby Bieber following the advice of his mentor Usher and now he's a grown man walking red carpets with the beautiful Selena Gomez on his arm! Justin's really done a lot of growing up in a year! Take a look back in OK!'s Bieber birthday gallery!

OK! GALLERY: JUSTIN BIEBER BIRTHDAY — 17 CELEBRITY "BELIEBERS"

Justin is already 17! Can you beliebe it? The good news is he's just as adorable as when he was a "baby."

The Biebs' career only seems like it will be going up from 16!

OK! VIDEO: WATCH JUSTIN BIEBER KISS SELENA GOMEZ OUTSIDE OSCARS AFTER PARTY!

How is Justin celebrating the big day?

Well, he's hoping to have a slice of his grandma's cherry cheesecake!

But if that doesn't work out or if he just wants another piece, The Cheesecake Factory has a free slice waiting for him to come and pick up.

Or maybe we'll just have to have one in his honor!