?sunglasses Kate Hudson  dress beach party
?sunglasses Kate Hudson  dress beach party
sunglasses Kate Hudson  dress beach party

Kate Hudson took her tow-head tot Bingham to the beach in Malibu, on Sunday, for a friend's birthday party, and it looks like the group had a beachin'-good time.

The mother-of-two was without baby daddy Matt Bellamy and without her older son Ryder, but nonetheless, she was in good spirits and up for chasing Bing around in the sand and pulling him on an inflatable shark. Cute!

Kate had her hair wrapped in a towel and covered up in a short, flowy chiffon tank dress and Isabel Marant sandals. Bing had his long, blonde hair up in the same style his half-brother used to wear when he was a small tyke.

The pair were on the beach for almost two hours, celebrating a pal's birthday, and while Bing enjoyed cake, mom Kate stuck with calorie-free watermelon. So that's how she maintains her slender physique!