The four-piece R&B-grime crossover act won the Final performing another original new song.
Simon Cowel said "Guys' you are tremendous. Guys, I wanna say you have given respect to everyone around you, its about your friendship and I think you will make a difference and deserve it."
Rak-Su performed another original track, and teamed up with two special guests - Wyclef Jean and Naughty Boy.
Naughty Boy saw the lads on X Factor and was impressed, and he’s actually known them since school.
Rak-Su have known each other for 16 years, returned to fans waiting back in their hometown Watford.
They performed at the Watford Football Stadium during half time.
Tonight the four-piece R&B-grime crossover act were singing their first audition track, "I’m Feeling You", the judges loved it. Simon Cowel was blown away.
Feeling You on iTunes
Dimelo (feat. Wyclef Jean & Naughty Boy)