One Direction have become good mates with Canadian heartthrob Justin Bieber - and they love what he does.
Justin released his latest record Believe yesterday and 1D's Niall Horan, 18, was quick to let the singer know he's a huge fan.
'@justinbieber congrats bro! great album dude,' Niall Tweeted.
And it seems the appreciation is mutual - Justin, 18, recently revealed that he'd be open to a collaboration with the British boy band.
'If they want me on their album, they just have to ask,' Justin told Radio 2.
'They're talented.'
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