Matthew Gray Gubler has been working in Hollywood since 2004, and in the past 12 years, he's managed to become one of our biggest crushes. While the 36-year-old actor is sexy in a traditional, model type of way, he also has a really geeky side. You probably know him from TV shows like Criminal Minds and movies like 500 Days of Summer, and he shows off his quirky personality on Instagram, but for the most part, he seems to stay out of the spotlight, and we kind of love him for that. Despite the fact that he's not everywhere you turn, we've made sure to still keep an eye on him over the years. Keep reading to see some of his hottest moments, then check out his costar Shemar Moore's sexy snaps.