Gwen Stefani says having a second child has helped make her marriage stronger. The 'Hollaback Girl' singer - who gave birth to second son Zuma Nesta Rock last month - revealed her relationship with husband Gavin Rossdale has improved since they welcomed their new child into the world.Sponsored Links: She said: "Gavin loves being a dad and he wants to have a bigger family, too. I feel we are closer in many ways now that we are building something together outside our own crazy relationship. "We feel so blessed to be able to share this experience together and see how we have both become more romantic and caring for each other, simply because we have seen how beautiful it is to have come this far together and started a new chapter in our lives."Sponsored Links: Gwen, who also has a two-year-old son Kingston with Gavin, feels incredibly content since extending her family further. She added: "I feel happier now. I know every mother must feel this way but watching your child grow up and learn new things every day is one of the greatest and purest pleasures you can have."