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Alex & Sierra audition on 'The X Factor'

Last night was the big premiere of "The X Factor" and one couple really pulled off an amazing audition. Alex & Sierra shocked the judges with their own version of "Toxic" by Britney Spears.

They are a couple and have been dating for about two years. This couple was adorable together and obviously in love. Simon Cowell was really shocked when they announced what song they would be singing, but they did their own version and it was perfect.

At the start of their performance, it appeared that Sierra would be doing most of the singing, but later on Alex joined in and he was just as good of a singer as his girlfriend.

Sierra was a bit nervous on the stage, but she sang her heart out. All of the judges loved them and gave them a yes straight through to the next round. They work great together and it will be interesting to see what else they come up with later on during the season. They could probably make any song their own after the way that they changed "Toxic" to fit their own voices.

What did you think of their performance? Sound off in the comments below on your thoughts about Alex & Sierra.