Gwen Stefani Hits the Beach with Her Boys

Gwen Stefani shows off her toned tummy in a black bikini at the beach on Sunday (August 28) in Malibu, Calif.

The 41-year-old singer and fashion designer soaked up the sun with her shirtless hubby, Gavin Rossdale, and their two adorable sons Kingston and Zuma.

PHOTOS: Check out the latest pics of Gwen Stefani

The proud parents helped the boys build some sand castles before the family headed to the Malibu Country Mart later in the evening.

25+ pictures inside of Gwen Stefani, Gavin Rossdale, and their boys at the beach…