Congrats to Justin Bieber. The singer, who mined his heartbreak over his split with Selena Gomez into song, has debuted at No. 1 -- again -- with his acoustic EP, 'Believe Acoustic.' Biebs going No. 1? Big deal and old hat, right? Well, when you consider that he has enjoyed his fifth No. 1 and is the first artist to do so before reaching the age of 19, color us impressed.