RiRi performed 'Unfaithful' with Matt Cardle, and Aguilera belted out her ballad track 'Beautiful' with Rebecca Ferguson.
Rihanna and Christina Aguilera visited "The X Factor" finale with a bang over the weekend. RiRi was joined by Matt Cardle in a live "Unfaithful" duet, later telling him that he was "going to go far." Aguilera collaborated with Rebecca Ferguson for "Beautiful", praising her as "a very unique talent."
The other musical guests were will.i.am and Robbie Williams. The Black Eyed Peas member shared the stage with Cher Lloyd in "Where Is the Love" and "I Gotta Feeling". Meanwhile, the Take That star made a duet with One Direction in "She's the One".
The star-studded show which was part of the two-episode finale aired on Saturday, December 11 and saw Lloyd's elimination. Beside joining forces with the contestants, RiRi heat up with solo song "What's My Name?", and Aguilera catered with "Burlesque" anthem "Express". The finale continued the next day, announcing Cardle as the winner.
Rihanna's "What's My Name?":
Rihanna and Matt Cardle's "Unfaithful":
Christina Aguilera's "Express":
Christina Aguilera and Rebecca Ferguson's "Beautiful":