Demi Lovato joins X Factor USA judges on stage 00493
Demi Lovato joins X Factor USA judges on stage 00494
Demi Lovato joins X Factor USA judges on stage 00495
Demi Lovato joins X Factor USA judges on stage 00496
Demi Lovato joins X Factor USA judges on stage 00497
Demi Lovato joins X Factor USA judges on stage 00498
Demi Lovato joins X Factor USA judges on stage 00499
Demi Lovato joins X Factor USA judges on stage 00500