bigthumb.bspears082811_01_X17230.jpgWith a successful Femme Fatale tour, two beautiful sons and an upcoming engagement to longtime love and agent Jason Trawick, Britney Spears has lots to celebrate today on her 30th birthday!

X17online has been with Brit through all the ups and downs ... from the infamous shaved head incident to her rehab stay ... to her romance with a paparazzo.

Despite all the drama, seems as though B has managed to come out on top with a music career that's showing no signs of stopping. You go, girl!

Let's hope the "Criminal" singer gets some engagement ring bling on her birthday.

See more of Brit through the years in our massive gallery below.