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WATCH Julianne and Derek Hough's AH-Mazing Performance While Sia Sings Elastic Heart On Dancing With The Stars!

| Filed under: SiaJulianne HoughDancing With The StarsDerek HoughReality TV

What a grand finale!

Not only did they crown the winner of the coveted Mirrorball Trophy last night on Dancing with the Stars, but Julianne and Derek Hough popped by for a dance during the show.

And if that wasn't enough, Sia was there live singing her hit song Elastic Heart to give the soundtrack to the duo's performance (above).

[Related: And The Winners Of Dancing With The Stars Season 20 Are…]

Sia, of course, appeared with her face covered as she's been known to want to keep her privacy, but it didn't take away from the AH-Mazing performance she gave!

As per usual, Julianne and Derek were both absolutely incredible and we wouldn't expect anything less! The Houghs had a little help from mini versions of themselves that they paralleled on stage next to them.

Sia's song was a hauntingly beautiful soundtrack to each pair's struggles they showed through their interpretive dance.

Ch-ch-check out the amazing performance for yourself (above)!

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