Happy birthday, Ben Stiller! The actor turns 49 today. Best known for his roles in Zoolander, Meet the Parents, and recently The Secret Life of Walter Mitty (which was filmed in InStyle's HQ!), Stiller has worn many hats through the years, producing and directing many of the films he has also starred in. It's no surprise the actor-producer-director has found success, particularly in the comedy realm -- his father, Jerry Stiller, is also a comedian-turned-actor, who has appeared on the King of Queens and Seinfeld. How's that for a dynamic father-son duo?