As if he isn't scary enough already (have you seen his terrifying jackets, and those jeans that give "low-slung" a bad name?), Justin Bieber has posted a picture of himself on Twitter in a gruesome, teeth-baring mask.
Dubbed "Scarybiebs", the look is just that, and we do hope for girlfriend Selena Gomez's sake, that he doesn't take to wearing it around the house...
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See more from Justin in his Perfect 10 gallery below: