Justin Bieber's been giving fans (and people who have to write about him) a glimpse into the making of his new album Believe, and the latest installment sees him record his Nicki Minaj duet Beauty and a Beat - while Max Martin and his music crew get REALLY into it.

justin bieber behind the scenes of believe

The faces they make are similar to how we look when we eat a Nando's, and they're really, really intense.

Obviously Bieber finished recording the track and added some Nicki Minaj snazz to it, check out the final version here;

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What do you think?