Watch: Halsey & Big Sean performed 'Alone' together live.

Watch: Halsey & Big Sean performed 'Alone' together live.

Halsey and Big Sean appeared on The Voice last night to perform 'Alone' together live, accompanied by troupe of costumed dancers - reminiscent of the song's music video.

Watch the performance below...

P.S. Read our latest Halsey interview here.

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