Alex and Sierra - Best Song Ever - The X Factor - Video MP3

Alex and Sierra performed "Best Song Ever" on The X Factor USA 2013 Top 10 British Invasion Week.

Download: Best Song Ever

The duo are taking a risk by performing a popular One Direction song.

Sierra looks fantastic tonight.

I really like this. I like what they did with the song.

I think they blend so well together tonight. I just love this.

Standing ovations!

Demi Lovato: I think this was your best performance yet. I'm gonna go home and download that on iTunes.
Simon Cowell: This was a brilliant performance. It was really cool and laid back. I think you have a serious chance at winning this whole show.
Kelly Rowland: Such a difference from last week. You should be really proud of yourselves. I think Alex was stronger than Sierra.
Paulina Rubio: I loved the duet. That bridge is a little bit corny. You guys are good together.

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