Life's a beach for No Doubt's Gwen Stefani and kiddies, Kingston and Zuma.

OK! GALLERIES: GWEN AND KINGSTON HANG OUT

The happy family were spotted yesterday splashing around and digging in the sand for a birthday party at a beach in Marina del Rey, Calif. 

OK! GALLERIES: GWEN STEFANI, GAVIN ROSSDALE AND THEIR BEACH BUM SONS GET SOME SUN

The always-fab Gwen managed to keep a sleek red pout, smart black blazer and white tee spotless throughout  the entire afternoon.

After over a decade, her band No Doubt plan to release their sixth studio album on September 25.