Age: 23 

Liam doesn't look half bad in a suit, but that's a given, considering he (probably) has a stylist. What really lands him a spot on this list is his casual style. Whether he's out running errands, hanging out with the twerk queen herself, Miley Cyrus, or spotted in between shooting scenes for his upcoming movie Cut Banks, he makes a pair of chinos or jeans with a T-Shirt look clean. There isn't anything mind-blowing about his style, but he proves you don't need to be flashy to be "stylish."