Matt Cardle and Rihanna sing Unfaithful - The X Factor Live Final - itv.com/xfactor

The X Factor 2010 Final: It's time for the first of this year's star duets - and Matt's not doing it by halves. Singing her hit single Unfaithful - Matt welcomes none other than Rihanna to The X Factor stage! See more at itv.com/xfactor