'X Factor': Simon Cowell - 'Say Something' was Alex and Sierra's big moment

No matter how "The X Factor" turns out, Alex and Sierra are bonafide stars --at least that's what their mentor Simon Cowell thinks. The duo's rendition of "Say Something" hit No. 1 on iTunes (and is still there more than a day after the Top 6 performance show), and according to Cowell, this is their star-making moment. "We were watching all last night. People were texting me saying this record was flying up the charts and then as soon as I woke up this morning I got the news they were No. 1," Cowell tells Zap2it after the Top 6 results show. "Mind you, the original is like No. 3 or something. It's incredible. I've always said this about these shows: It's not about winning a silly trophy; it's about launching an artist. It's about a career outside of it and that's what I'm most proud of. It does launch proper artists." And yes, "Say Something"...



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