A man impersonating Justin Bieber apparently fooled the Wynn Las Vegas hotel into thinking he was the real deal, and he performed in front of a packed crowd.

A Justin Bieber impersonator duped staff at the XS Nightclub Saturday and crashed DJ Gryffin’s set — shirtless, in shades and belting out Bieber’s hits like he owned the place, sources told TMZ.

Fans went wild and filmed what they believed was a surprise Bieber cameo. Video footage shared by TMZ (and seen........

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