Gwen Renée Stefani (/stəˈfɑːni/; born October 3, 1969) 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 recorded Love. Angel. Music. Baby., her first solo studio album, in 2004. Inspired by music of the 1980s, the album was a success with sales of over seven million copies. The album's third single, "Hollaback Girl", was the first US digital download to sell one million copies. Stefani's second solo studio album, The Sweet Escape (2006), yielded "Wind It Up", "4 in the Morning", and the highest-selling single, the album's title track, "The Sweet Escape". Including her work with No Doubt, Stefani has sold more than thirty million albums worldwide.

She won the World's Best-Selling New Female Artist at the World Music Awards 2005. In 2003, she debuted her clothing line L.A.M.B. and expanded her collection with the 2005 Harajuku Lovers line, drawing inspiration from Japanese culture and fashion. Stefani performs and makes public appearances with four back-up dancers known as the Harajuku Girls. She married British musician Gavin Rossdale in 2002 and they have three sons: Kingston James McGregor Rossdale, born May 26, 2006; Zuma Nesta Rock Rossdale, born August 21, 2008; and Apollo Bowie Flynn Rossdale, born February 28, 2014. In 2009 Billboard magazine ranked Stefani the fifty-fourth most successful artist and thirty-seventh most successful Hot 100 artist of the 2000–09 decade.