Macau R & B superstar was friend of Justin Bieber . Usher has sold one albums . Passing on the advice of CNN Talk Asia '' he 's now mentor to teen sensation Michael Jackson .
U.S. R & B superstar was friend of Michael Jackson . Usher has sold over 40 million albums . Passing on the advice of `` King of Pop , '' he 's now mentor to teen sensation Justin Bieber .