Viggo Mortensen is a chameleon. He changes with his surrounding, becoming indistinguishable from the characters he plays on the screen. In short, he's one of the greatest character actors in Hollywood.
The Oscar-nominated actor also just so happens to be celebrating a birthday this month (even though he doesn't want you to know). Let's celebrate him with these 10+ facts about Lord of the Rings star Viggo Mortensen fans didn't know!