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Sia Performs in an ‘Elastic Heart’-Shaped Box on ‘Ellen’

SPIN's 2014 Artist of the Year also announced plans to sing at the Grammys next week

Sia is no stranger to Ellen Degeneres’ stage at this point (she famously sang “Chandelier” last May), and yesterday she stopped by again to do “Elastic Heart” — with some help from her favorite dancer, Maddie Ziegler, of course. Assembled with a crew of kids (and the Dance Moms star) wearing giant white cubes and blonde bob wigs, Sia was slightly more visible than usual as she faced the camera (albeit in the back of the lineup) with long bangs covering her face.

Meanwhile, Ziegler, who wore her trademark hairpiece and beige leotard, led the show as she lip-synched and waved her upper body in an impressive interpretive dance. To finish off the set, SPIN’s 2014 Artist of the Year made a special announcement: She’ll perform at the 2015 Grammys, airing on Sunday, February 8. Watch Sia sing “Elastic Heart” at EllenTV.com