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Naomi Watts and Liev Schreiber hit the beautiful blue waters of St. Barth with their sons Sasha and Kai.

Liev and Sasha went for a solo ride on a tube while mom Naomi cheered them on. Looks like they're having a blast!

The family of four has been enjoying their luxury vacation aboard the huge sailing boat Athena. Now THIS is what we call R&R.