She knows how to dress for the sea and the sand!

Gwen Stefani and husband Gavin brought their boys to a Memorial Day BBQ at Joel Silver's Malibu beach house yesterday, and they weren't the only celebs in attendance!

Kate Beckinsale, Diane Kruger, Jason Statham, Dianna Agron, and Sean Penn were among the other famous guests at the fete.

The No Doubt front woman and her rocker beau enjoyed some fun in the sun as they chased sons Kingston and Zuma around in the sand, and apparently they even made time for some romance in between parenting duties.

"Gavin shot her a really sweet look. And she looked back. It was a nice checking-in moment," a source at the bash told Us Weekly.

We wish we had been on the list!