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malibu Gwen Stefani skirt beach no doubt swimsuit bikini sunglasses

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!