Liev Schreiber took his older son Alexander out to the LA Zoo for a boys' day on Wednesday. Naomi Watts was off filming Mother and Child in LA, which also explains why she missed The International's premiere at the Berlin Film Festival last night. Liev and Alexander seemed to enjoy their alone time as they checked out giraffes and ate ice cream together — so sweet. Baby Samuel is still too young to tackle such an outing, but Liev will surely be happy to have both his sons along when the time is right.