Hollaback Girl -- Gwen Stefani turns 44 years old today!
No Doubt first hit the scene in 1986, with Gwen as the group's frontwoman. Before the ska-pop band made it big with their '95 album "Tragic Kingdom," Stefani shared some awesome duets with Sublime -- lending her vocals to tracks like "Saw Red."
The group became radio gold with singles like "Just a Girl" and "Don't Speak." But in 2004, the blonde bombshell decided to go solo and dropped her hit album Love. Angel. Music. Baby. -- she topped the charts with songs like "Rich Girl" and "What You Waiting For."