Gwen Renée Stefani is an American singer, songwriter, fashion designer, and actress. She is the co-founder and lead vocalist of the rock band No Doubt. During the band's hiatus, Stefani embarked on her solo career, releasing her debut album Love. Angel. Music. Baby. in 2004. Inspired by music of the 1980s, the album was a success with sales of over seven million copies. It spawned three major hit singles: "What You Waiting For?," "Rich Girl," and "Hollaback Girl," the latter becoming the first US digital download to sell one million copies. Stefani's second studio album The Sweet Escape was released in 2006. The album produced two successful singles: "Wind It Up" and the album's title track "The Sweet Escape." Including her work with No Doubt, Stefani has sold more than thirty million albums worldwide.