"After an elaborate and multi-step ruse by him and his advance team, a Justin Bieber impersonator was granted access to the XS stage," a rep for Wynn Las Vegas told Us Weekly.

Justin Bieber hasn’t been “acting like himself,” a source exclusively tells Parade.

“How Bustin Jieber duped me during my own set,” Gryffin captioned the clip, referring to the mimicker.