Un-belieb-able.

A Justin Bieber impersonator ran up a $10,000 bar tab after he tricked staff at a Las Vegas nightclub into believing he was the Canadian pop star — even getting up on the stage for an impromptu performance.

The bizarre incident took place at the five-star Wynn Las Vegas, where LA-based DJ Gryffin was performing at XS Nightclub. 4

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Gryffin was told that Bieber, 31, was in town and wanted to make a surprise appearance during his Saturday night show. Believing he was the real Biebs, he invited him into the DJ booth, TMZ reported .

Video posted on social media shows the shirtless, tattooed impersonator, wearing dark shades and low-slung blue jeans, belting out a version of Bieber’s 2015 hit “Sorry” in front of a packed nightclub crowd, all of whom appeared obliv

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