Happy birthday, Ian Somerhalder! The Vampire Diaries actor turns 36 today. Before playing Damon on the hit show, Somerhalder scored his breakthrough as Boone in Lost and Adam in Smallville. Outside of acting, the master of the brooding stare is a philanthropist and recently joined the Conservation International’s Nature Is Speaking environmental awareness campaign. The advocate even founded the Ian Somerhalder Foundation to positively impact the planet and animals. Not only is he an animal lover, but he also has one of the sexiest set of abs in Hollywood. In honor of his birthday, we’re taking a look at the hottest bods in the business -- including the birthday boy's!