12/05/2013 05:41 am ET

'The X Factor': Alex And Sierra Make Destiny's Child 'Say My Name' Their Own (VIDEO)

It was "Diva Week" on "The X Factor," which wouldn't be a term used to describe the sweet couple Alex & Sierra. Nevertheless, they took on one of the most daunting tasks you can on a singing competition. They tackled Destiny's Child's "Say My Name" ... in front of one of the members of that group, judge Kelly Rowland.

But the couple's signature style completely transformed the piece into something wholly unique. Kelly couldn't deny it's appeal. "It was a couple of moments in there where I’m like, ‘Is this ... is this my song?’ I was really shocked, but you guys really actually pulled that off," she told them.

Over at TV Line, Michael Slezak dubbed it the top performance of the night, giving them an A+. "It’s not easy upgrading Beyoncé, Kelly and those other two, but damn — Alex and Sierra’s sweet harmonies, verbal dexterity and playful humor made me feel like DC’s R&B warning to a cheating lover was born to be a duet!" he wrote. "[This] made this one of the best 'X Factor' performances, well, ever!”

Buddy TV's John Kubicek agreed, saying that a finale without the duo wouldn't even be worth watching. That finale comes in two weeks as "The X Factor" continues on Wednesdays and Thursdays at 8 p.m. EST on Fox.

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