Monday, November 24, 2014 6:50am ET by  
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One Direction's Niall Horan talks up the 'unbelievable' Ariana Grande

Niall Horan has lavished praise on Ariana Grande.

The US singer performed at the American Music Awards on Sunday (November 23), with One Direction watching on from the crowd.

It seems the 'Problem' star had a big effect on Horan, who tweeted after the show:

"Cannot believe what just happened this evening! 3 AMA's including artist of the year! We literally cannot thank you enough! Love you lots.

"Also @ArianaGrande was absolutely insane tonight! Her vocal ability is just unbelievable! What a voice!"

One Direction meanwhile hit No.1 in the UK on Sunday (November 23) with new album 'FOUR'.

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Watch One Direction in action below: