Gwen Stefani co-founded No Doubt.
Gwen Stefani . She is the co-founder and lead vocalist of the band No Doubt that experienced major success after their breakthrough studio album Tragic Kingdom ( 1995 ) along with various successful singles , including `` Just a Girl '' , `` Do n't Speak '' , `` Hey Baby '' , and `` It 's My Life '' . No Doubt . Since 1994 , the group has consisted of vocalist Gwen Stefani , bassist and keyboardist Tony Kanal , guitarist and keyboardist Tom Dumont , and drummer Adrian Young .