The Watford quartet now release their winner's single Dimelo, which is available to download and stream now.
But their win has been slightly overshadowed by the fact that fans are branding this series of X Factor the worst ever, and that the time has come for Simon and co.to call it quits. No results yet but the grand victor will be revealed at the end of the Live Final tonight, Sunday, December 3, 2017.
They then performed Demelo, one of their hit singles from this year's season.
He also praised runner-up Davies, saying: "Congratulations to Grace who is really an outstanding, outstanding artist", ITV News reported. This doesn't get paid for for nothing.
Rak-Su performed with Naughty Boy and Wyclef Jean on Saturday night, while fellow finalists Grace Davies and Kevin Davy White performing with Paloma Faith and Tokio Myers respectively.
Simco Limited will donate 100% of its profits from the sale of each download and in respect of all audio streaming of the single, and the Chancellor has also agreed to donate the Value-Added Tax, in each case to be shared equally by Together For Short Lives and Shooting Star Chase.
Simon also said he'll donate the proceeds from the winner's single, which were revealed last night.
"This is what we're gonna try and do this weekend, we're gonna try and raise a million pounds for this charity".
"Meet these people, you'll understand how important it is".