Actor Liev Schreiber -- who has two boys, 4-year-old Alexander "Sasha" Pete and 3-year-old Samuel Kai, with longtime love Naomi Watts -- admits that being a dad is challenging. "The minute that they show up and you hear that first scream, it’s a pretty profound feeling," he told Hamptons magazine in 2009. "You know that you’re in for the best thing that ever happened to you and the hardest work you'll ever do." Luckily, the handsome star, 44, quickly found that he had what it takes. "I think it came naturally to me," he said.