Kelly Clarkson Slays A Capella Cover of Sia's 'Chandelier,' Hilariously Wears Wig During Performance -- Watch!

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We know who Kelly Clarkson is going to be for Halloween!

Kelly Clarkson is getting in the Halloween spirit!

The 34-year-old singer took to Facebook Live on Friday to show off her amazing Sia Halloween costume, and got in character with a fierce cover of the singer's hit, "Chandelier."

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"Welcome! Hey, what's up? I'm Sia this Halloween. What?!" Clarkson hilariously announced to her viewers while sporting Sia's famous face-covering white locks. "She's one of my favorites, so I thought I'd wear a wig and be Sia. I'm gonna cover a Sia song right here real quick, and I'm gonna talk to you."

"I've had a full day in New York, and now I'm back in Tennessee, and this is our succulent wall that we're having for our masquerade ball that we're having tomorrow night," she said, pointing to the wall behind her. "We're having a big party, and anyway, I thought I'd sing in this beautiful greenhouse."

"Anyway, this is called 'Chandelier,' so here we go. Here you go, Sia. I hope you like it," she said, giving a shout-out to the singer before starting her performance.

See Clarkson slay Sia's hit song below: 

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Clarkson may have rocked her Facebook Live performance, but that's not always the case. The mother of two hilariously forgot the lyrics to her own songs during a Facebook Live session in July.

"Dear Lord, I don't know lyrics!" she said while attempting to sing her 2004 hit "Walk Away." "This is hard! I'm sweating!"

See more in the video below.