Bieber isn't a great dancer, but he's getting there. With Usher's help, he'll have the popping and locking down in no time. The Beebs is growing up, but slowly. He's a little bit taller, a little bit bolder, and he's wearing slightly more leather. But he smiles when he dances and it's still O.K. for teenage girls to like him. And Jaden Smith, 12, raps as well as any 15-year-old. (Sidenote: How are Will and Jada Pinkett Smith producing such precocious children? Did they read that Tiger Mother book or something?) Meanwhile, Usher makes one of the worst songs of 2010 almost listenable. When I watched him glide across the stage, I almost forgot that "OMG" is primarily a ringtone disguised as a club anthem.