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Alex & Sierra auditioned in New Orleans, Louisiana, making it to the next round after wowing the judges with a sultry version of Britney Spears' "Toxic". They continued on to the top 40 and received Simon Cowell as their mentor. [5]
Buy "Alex & Sierra - The X Factor USA Season 3 Live Performances" on iTunes: http://goo.gl/smyA9F | Audition