Lady GaGa is number one on the Billboard Hot 100 with "Just Dance," the first single from her album The Fame (Interscope/UMG) and her first number one hit!

Did you know Lady GaGa started her career as a songwriter? She actually wrote songs for pop acts such as the Pussycat Dolls before embarking on her solo career.

Check out more songs fro Lady GaGa's The Fame including "Starstruck," "Paparazzi" and "Brown Eyes."