Demi Lovato joins X Factor USA judges on stage 23513
Demi Lovato joins X Factor USA judges on stage 23514
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Demi Lovato joins X Factor USA judges on stage 23517
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Demi Lovato joins X Factor USA judges on stage 23520
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Demi Lovato joins X Factor USA judges on stage 23522
Demi Lovato joins X Factor USA judges on stage 23523
Demi Lovato joins X Factor USA judges on stage 23524