Dimitrios Kambouris/Getty Images
It's a very special day for the Queen of Pop!
That's right, our favorite "Material Girl," Madonna, is celebrating her big 55th birthday today.
The mother of four had quite the year as she spoke out for several causes extremely important to her.
Madonna rejoiced this June when the Supreme Court ruled on DOMA and Prop. 8. "I'm smiling from ear to ear," the singer said in a statement when she learned same-sex couples could marry in California. "There is a G-D! Justice is served. Hallelujah!"