Lady GaGa  

Stefani Joanne Angelina Germanotta (born March 28, 1986), who performs under the stage name Lady Gaga, is an American singer, songwriter and musician. She began her career as a songwriter for some of pop music's biggest stars, including Fergie, Pussycat Dolls, Britney Spears and New Kids on the Block, as well as American singer and produc..