People say happiness is a warm puppy—but it's also Matthew Gray Gubler. The 35-year-old Criminal Minds actor was nothing but gracious, warm, and engaging during our sit-down interview in his trailer on location for the CBS drama, where he's in the middle of taping scenes as Dr. Spencer Reid. As soon as we arrive, he greets us with a big hug, and then leads us along the lunch line for an enormous spread of fish tacos, chicken, and other delicious sides. If actors are often known for only thinking about themselves, then Matthew clearly hasn't gotten that memo. A constant theme throughout our hour-long interview is gratitude, and it's a topic that comes up quite often. "I've noticed if you stay alive long enough and you just continue to work hard, you'll inevitably be successful," says Gubler. And successful he has been. A natural-born performer since he could walk and talk, Gubler found happiness from entertaining others. Now, in his 11th season on Criminal Minds, Gubler still hasn't lost his enthusiasm for performing or the procedural that has opened more doors than one can keep count. He voices Simon in the Alvin and the Chipmunks films (the most recent film