Happy 9th Birthday, Maddox Jolie-Pitt!

It's hard to believe but Angelina Jolie and Brad Pitt's baby boy Maddox Jolie-Pitt is already turning nine!

OK! GALLERY: ANGIE TOTES THREE OF HER BROOD TOY SHOPPING

Maddox was adopted in 2002 and since then we've seen him go through a lot of changes! Not only did Brad become his dad, but he's now the big brother of his five siblings!

OK! COVER STORY: JEN'S STEALING BRAD BACK!

This super stylish Jolie-Pitt son has also changed up his look a lot in the past few years. Take a look back at how Maddox has grown up into the handsome nine-year-old he is now!

FOR MORE ON BRAD PITT AND HOW JENNIFER ANISTON IS STEALING HIM BACK, PICK UP THE NEW ISSUE OF OK! IN STORES EVERYWHERE NOW!