Justin Bieber got his Halloween [1] on early on Friday, revealing his pop culture costume [2] to his Instagram fans. Justin channeled his inner Will Ferrell [3] as Jackie Moon from Semi-Pro, complete with a curly red wig and a basketball. It hasn't been the easiest week for Justin; he walked out of an awkward interview [4] in Spain and cut a performance short in Norway [5]. Justin posted an apology [6] on Instagram, writing that he hasn't been sleeping much and he's sorry to any fans he disappointed.