Canadian superstar Justin Bieber has posted a preview of his upcoming acoustic album to celebrate six years since his debut on YouTube.

The teenage heartthrob shot to international fame after being discovered on the popular video sharing website by his now manager Scooter Braun.

Bieber honoured the six year milestone with an acoustic performance of 'Take You' from his upcoming 'Believe Acoustic' album.

Speaking to fans before singing the stripped back track, Bieber said: "What's up guys, it's actually been six years since I posted my first YouTube video ever, so we are going to post right now a little preview of my acoustic album, one of my favourite songs from the album which is 'Take You' so here it is."

Bieber has previously revealed that the new album will be an honest offering and confirmed that details of his private life will feature on the album.

Earlier this week he tweeted: "Ready? #newmusic - with everything going on I'm gonna tell u myself how I feel. #15Days (sic)."

'Believe Acoustic' will be released on January 29. Watch the video here: