Rihanna x Matt Cardle | Unfaithful
Rihanna actually didn't sound too bad! Forget the duet....Rihanna looks amazing!
Christina Aguilera x Rebecca Ferguson | Beautiful
Rebecca was outsung by Christina and she literally looked at the floor
Robbie Williams x One Direction | She's The One
Will.i.am x Cher Lloyd | Where Is The Love x Got A Feeling