WATCH: Louisa Johnson Sang Mariah Carey's 'All I Want For Christmas Is You' 100% A Cappella, And... WOW.

10 December 2017, 18:40 | Updated: 10 December 2017, 19:50

THE VOCAL CHORDS ON HER! WOW.

There's a reason why Louisa Johnson won 'The X Factor'. It's because she could literally sing the ingredients on a can of spaghetti hoops and it would sound magical.

That's why Rob Howard decided to get her to show off her talent for everyone at #CapitalJBB backstage.

> Dua Lipa Got Locked In The Blokes' Loo And Filmed It All On Snapchat, Begging For Help!

Louisa Johnson with Rob Howard

After she rocked The O2 singing Mariah Carey's classic Christmas anthem on Saturday, Rob asked the 'So Good' gal to perform 'All I Want For Christmas Is You' totally a cappella, and...

WOW.

We wouldn't even judge you if you wanted to listen to this right up until August.

> Louisa Is Going To Be 'So Good' On The #CapitalJBB Stage, So Get Our App And Check It Out...

Wait until you hear Louisa sing some of the biggest songs of the year. She's good, ain't she?

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