A promo video for Justin Bieber's upcoming Saturday Night Live appearance has been unveiled.

The singer is due to host and sing live on the iconic US show this weekend (February 9) as he promotes his recent release 'Believe Acoustic'.

The Canadian tweeted yesterday (February 5) that he was filming promo clips ahead of the show to publicise his appearance.

The video has since emerged online, with Bieber running through his lines whilst indulging in some fun conversation.

As previously reported, Bieber recently took to Twitter to talk about speculation surrounding his private life, tweeting: "Some of these rumors about me are getting a little out of control now. Don't believe the bs. Gonna focus on the positive."

Watch the promo clip below: