Demi Lovato told them they were one of her favorite acts, but questioned the future and their relationship, which annoyed their mentor Simon Cowell due to his support of Alex & Sierra as a couple. For the first live show, Alex whipped out his guitar for the duo's stripped-down version of the Robin Thicke hit "Blurred Lines".
Kelly Rowland did like the performance but warned them not to let their performances become too corny, something Simon Cowell disagreed with.
For British Invasion night, Alex & Sierra took on the One Direction hit "Best Song Ever", slowing down the tempo and changing the arrangement completely.
The performance earned them massive applause from the audience and a standing ovation from Simon Cowell.
Their "Diva" song was "Say My Name" by Destiny's Child, which did make Alex & Sierra nervous because they were going to be singing the song in front of Kelly Rowland, who had been a member of Destiny's Child. Their "Unplugged" song, "Say Something" by A Great Big World and Christina Aguilera, was a risk for them because of Sierra deciding to play piano on the song.
They got the chance to write songs with some big names including John Legend, Jason Mraz, and One Direction's Harry Styles.Alex & Sierra were an American indie folk-pop duo based in Orlando, Florida who won season 3 of The X Factor USA.They were a part of the Groups catagory, mentored by Simon Cowell.Alex & Sierra won the X Factor on December 19, 2013. In one of their post-show interviews, Alex & Sierra said that they planned to get to work on their debut album as quickly as possible.They revealed via Instagram that they are now signed to Columbia Records.They then went up against the other 7 acts in a face-off.