Stefani and her husband Gavin Rossdale welcomed a second son into the world yesterday (August 21), reported People.
The new baby, who was named Zuma Nesta Rock Rossdale, will join big brother Kingston, who turned 2 in May.
The family stated, "Kingston, Gwen and Gavin Rossdale welcomed the newest member of their family. Mother, baby and family are all happy and healthy."
The 38-year-old singer comes from a family of four children and has always said she wants a big family, too.