Hilary Duff's Staying Afloat with Mommy Duties

Hilary Duff is staying above water when it comes to motherhood.

Hilary's soakin' up the sun with her son, Luca, and friends over in Hawaii. She's taking it all in -- some fun on a paddle board, catching some rays and definitely some waves ... all in mommy mode.

Motherhood suits her well ... especially in a striped bathing suit, despite it being understandably PG.