Kristen Wiig steals show in surprise 2015 Grammy performance with Sia

The only performers that could outshine a Beatle were a little girl and a 'Saturday Night Live' alum.

Sia performed her hit "Chandelier" at the Grammys alongside her mini-me, 12-year-old Maddie Ziegler, and surprise guest Kristen Wiig -- and while Wiig is known for her comedy, she killed it.

At this point, we all know that Sia's child counterpart is able to tell a story with nothing more than a wig and a nude unitard, but viewers at the Staples Center and at home were shocked to see the comedienne's skills.

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Neil Patrick Harris tweeted, "Who knew Kristen Wiig was such an amazing dancer! Wait. I think someone put something in my drink. This ain't right. #whatishappening."

Lucky Magazine posted, "Kristen Wiig JUST WON THE #GRAMMYs."

Also, making an appearance during Sunday night's award show was Sia's "Elastic Heart" dancer Shia LaBeouf, who introduced Sia with the reading of a love letter.

Sia, who doesn't want her face to become recognizable, was more than happy to be upstaged by her collaborators. She remained downstage, standing in a corner.

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