Can You Guess the Shirtless Celebrity Dad Enjoying Some Fun in the St. Barts Sun? (PHOTOS)

Liev Schreiber hit the beach with partner Naomi Watts and their two sons, Sasha and Samuel, in St. Barts on December 31.

The 45-year-old actor is poised to enjoy a successful 2013 as the star of the new Showtime series Ray Donovan and the political thriller The Reluctant Fundamentalist.