Justin Bieber Survives Shirt Storm In Nightclub Attack

9/3/2013 5:00 PM PDT

Justin Bieber -- Survives Shirt Storm in Nightclub Attack

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Justin Bieber
's perfectly chiseled torso was threatened by a lone attacker in a Canadian nightclub -- leading to a big mystery:  Was JB's shirt ripped open, or did he voluntarily bare his abs?

TMZ investigates ...