PHOTOS: One Direction Give 'Amazing' Performance On X Factor USA

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They were spotted rehearsing for their performance on the X Factor USA yesterday, and it appears that practice made perfect for Harry Styles, Zayn Malik, Niall Horan, Liam Payne and Louis Tomlinson who gave an "amazing performance" on the show last night.

Taking to the stage which was decorated by the iconic red phone boxes, the lads performed their hit single, 'Live While We're Young' and their new single, 'Little Things'.

With the boys looking dapper in their outfits, it's no surprise that the audience went wild.

Crediting X Factor USA judge Simon Cowell for putting the lads together, co-host Mario Lopez told the audience: "Now gentlemen, we all know Mr Simon Cowell is basically responsible for bringing you guys together when you were contestants on the X Factor in the UK."

And it appears that Simon was more than happy to bask in One Direction's glory, tweeting after their performance:

"One direction were amazing on X factor tonight. Very proud of the boys."

Take a look at the boys performing on the X Factor last night!

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