She's been celebrating her sweet 16 for so darn long, it's hard to believe Miley Cyrus hadn't actually reached the big birthday milestone - until today!!!!

Happy birthday, Miley! xoxoxoxo!

We hope she enjoys a rockin' b-day swan diving into her pile of money (Scrooge McDuck style), posting racy MySpace photos, and getting to first base with beau Justin Gaston (just two more years until you can move past that, J-dog).

We love celebrity birthdays, but ones like this don't come along every day. We so heart the Hannah Montana star. Leave your birthday shout-outs to her as comments below, then click to enlarge these additional Miley Cyrus photos ...