X Factor 2013's Alex and Sierra vs. The Voice’s Melanie Martinez on "Toxic" — Who Sang it Best? (VIDEOS)

Historically, Britney Spears songs have done well for realitycompetitionhopefuls. Just ask Voice contestant Tony Lucca, whose cover of "Baby... One More Time" topped the iTunes' singles chart back in 2012. So we weren'tsurprisedwhen X Factor 2013 duo— andreal-life couple— Alex and Sierra covered Britney's hit single "Toxic." But it was their stripped-down, acoustic duet that really blew us away! The duo, who can only be described as the hipster Civil Wars, wowed the judges with their simple...



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