Gwen Renée Stefani is an American singer-songwriter, fashion designer and actress. She is a co-founder, lead vocalist, and the primary songwriter of the band No Doubt, whose singles include "Just a Girl", "Spiderwebs", and "Don't Speak", from their 1995 breakthrough studio album Tragic Kingdom, as well as "Hey Baby" and "It's My Life" from later albums. During the band's hiatus, Stefani embarked on a solo pop career in 2004 by releasing her debut studio album Love. Angel. Music. Baby. Inspired by pop music from the 1980s, the album was a critical and commercial success. It spawned six singles, including "What You Waiting For? ", "Rich Girl", "Hollaback Girl", and "Cool". "Hollaback Girl" reached number one on the Billboard Hot 100 chart while also becoming the first US download to sell one million copies. In 2006, Stefani released her second studio album, The Sweet Escape.