my thesis is that it is them trying to show a more mature look by shedding their 'pretty boy' image. Therefore making people take them more seriously as an artist
It seems like only the super hot/sexy ones make it going solo, however Justin is a wonderful artist, and he does damn well. Nick Jonas may get up there someday, he's just started out and well, Zayn, we have yet to see. Still, it's a trend: the hottest, makes it.
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