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    Demi Lovato challenges Corden to a 'diva-off'

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Demi Lovato challenges Corden to a 'diva-off'

Demi Lovato and James Corden sing a series of songs in a "diva-off" battle on "The Late Late Show."

Demi Lovato challenges Corden to a 'diva-off'

Demi Lovato and James Corden sing a series of songs in a "diva-off" battle on "The Late Late Show."