Gwen Stefani 's band , No Doubt , released the album Tragic Kingdom after 1995 .
She is the co-founder and lead vocalist of the band No Doubt that experienced major success after their breakthrough studio album Tragic Kingdom -LRB- 1995 -RRB- along with various successful singles , including `` Just a Girl `` , `` Do n't Speak `` , `` Hey Baby `` , and `` It 's My Life `` .
Gwen Stefani