The world's most unlikliest 'Beliebers'

It's not just young girls who are Justin Beiber fans you know - some of the biggest names in rock have sheepishly admitted their admiration for the pop heartthrob.

Heavy metal overlords Metallica are Beliebers, for instance.

The 'Sad But True' legends are impressed by the 19-year-old - whose fans are affectionately referred to as Beliebers - after he said their tracks 'One' and 'Fade to Black' are his "jams".

Speaking to Q Magazine, singer James Hetfield said: "Are we Beliebers? Yes."

Drummer Lars Ulrich was a little less enthusiastic, but said: "Is it possible to have respect for him without being a Belieber? I think the kid's really talented and obviously to go through what he's going through at that early age must be a mind***k.

"So the fact that he still goes out there and does it, I admire that and I think he's super talented, so I guess I am kind of a Belieber. If he likes 'One', and Liam Gallagher likes him, OK, there you go."

Beiber was recently filmed backstage at a concert singing the guitar solo to 'Fade to Black' while playing air guitar, accompanied by backing musician Dan Kanter.

Beady Eye singer Liam declared himself a Belieber after Justin came on stage two hours late for a concert in London.

He said: "I've got his f***ing back, man. Anyone who goes on two hours late is fucking right in my book.

"All these so-called rock bands that sit backstage going: 'Hey, let's wait 15 minutes'.

" F**k that, wait two hours and 15 minutes! No one will beat that, ever.

"So get off his back, man -- I am a Belieber!"