Teen dream Justin Bieber has been showing off his dark side lately, allegedly punching a photographer and 'fessing up to underage drinking.

And now it seems the Biebs is adding a touch of rebel spirit to his wardrobe, too. The 18-year-old singer left a London BBC radio station on Wednesday morning wearing a sparkly accessory designed to look like a human skull -- a far cry from his more innocuous Christmas sweaters.

So, Biebs... is that a McQueen-designed Kleenex? A bandanna for a ghost cowboy? Or maybe he is just jumping on the trend train and going Goth.

Check out Bieber's sparkly skull mask below and help us figure this out.

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