A few weeks later we went to a studio to record the video - it was really good fun because The Darkness were there.
We chatted to them and they were really nice. I asked them what it was like performing at Reading and opening Glastonbury and they said it was good.
In the video we appear with the band as a group of carol singers.
We're dressed up in winter clothes but it was really hot filming under the bright lights - we were on set for a whole day.
I might get recognised!
I really hope Christmas Time (Don't Let the Bells End) goes to number one - it's a bit different because it's not cheesy, it's rock music.
It's really exciting to think that we're going to be seen by millions of people and especially as it looks like the song is heading for the Christmas number one.
But I'm not sure people will recognise me because we're wearing hats, but I suppose it might happen! "
Ruby, 13, Haberdashers' Aske's Hatcham College
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