Christina Aguilera "Express"
Christina Aguilera & Rebecca "Beautiful"
Rihanna "What's My Name?"
Rihanna & Matt "Unfaithful"
As The X Factor winds down this year in the UK, Christina Aguilera & Rihanna were both on-hand to perform twice, once by themselves & once as a duet with one of the final four contestants. In addition to a decent showing of her "Burlesque" tune, Christina sang with contestant Rebecca, whose voice I was surprised by/like a lot! Rihanna worked them hips before dueting with contestant Matt, who I assume/pray doesn't usually sing stuff like this because... THAT voice? Really?!