14. Justin Bieber

He started the year as another young heartthrob—all hair and voice, no style. But as 2011 progressed, Bieber developed a little personal swag. And as he nears his 18th birthday, he's starting to make moves with more determination and a better wardrobe than ever, opting most often for low-key leathers, slim jeans, hightops and some fresh grown-up fits for formal occasions. He even stepped out rocking every fashion nerd's favorite label, Junya Watanabe, during a live performance on the Today Show. We may not have his tracks on repeat yet, but you gotta respect the kid's hustle: he recently hopped on a few beats to drop some bars as Shawty Mane, spent some time in the studio with DJ Drama, and is planning to work with Drake in January.