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Gwen Stefani hit the beach in Malibu Sunday ... with her milky white skin baking in the intense Southern California sun. Check out the 41-year-old No Doubt singer's sexy bikini bod!

Wearing a tiny black bikini top, flowy skirt and rockin' her signature red lips, Ms. Stefani was enjoying a family day with her boys and hot hubby Gavin Rossdale.

After taking a little stroll, the two stopped by to chat with Maria Shriver, who was all smiles while wearing her white beach cover up. Who knew these three were friends? What a small world!

malibu Gwen Stefani Maria Shriver skirt beach no doubt swimsuit

Gwen and Gavin later played around with their youngest son, Zuma, in the sand, and hand-fed him a sandwich. Adorbs!