The X Factor 2010 Final: Rebeccas duet is with someone who shes idolised for years. International superstar Christina Aguilera joins Rebecca on stage for a .\rbr\rbrThe X Factor 2010 Final: Rebeccas duet is with someone who shes idolised for years. International superstar Christina Aguilera joins Rebecca on stage for a .\rbr\rbrThe X Factor 2010: Rebecca has wanted to sing this song for a very long time, so saving it for last was a very wise move. Will this moving performance by .\rbr\rbrThe X Factor 2010: Rebecca loved her performance last week, despite being incredibly nervous. Her confidence is still a problem for her, and it shows even in .