Best. Duet. Ever!

Hold the phone, One Direction and Justin Bieber on one track?! 'Scuse us while we pick ourselves up off the floor, but from the look of a recent tweet from Niall Horan, it looks like one of the best duets EVER could be happening! He tweeted: "in the studio with our boy @justinbieber last night , its gona sound great!" Woop! Reaaally hoping that this isn't like the wishes on a birthday cake sitch and that even though we've told you it'll still come true. Crossing EVERYTHING! What do you think of them teaming up?

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