'X Factor': Alex & Sierra on 'Say Something' and Destiny's Child

After weeks and weeks of "The X Factor" live shows --and weeks and weeks of critiques from the four judges -- Alex and Sierra finally have tough enough skin that the criticisms don't affect them as much. "I think I have just gotten to the point where I really want good comments from them but I'm kind of like whatever happens happens and I'm gonna just not care what anyone says even though I really do care," Sierra tells Zap2it backstage after her performance on the Top 6 live show. Adds Alex, "She's convinced herself that she doesn't care. ... It's fun watching her be this Sierra, because this is the Sierra I've always known. It's fun to see her not afraid of what someone's going to say to her. She's just doing what she does and leaving it all up there." Luckily, though, their feedback was universally positive -- probably because they absolutely destroyed (in...



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