Demi Lovato Jamming To 2 Chainz Before Her VMA Pre-Show

'It's kind of nerve-racking,' 'Skyscraper' songstress says of performing at VMA pre-show tomorrow (September 6) at 7 p.m. ET. By Terri Schwartz, with reporting by Ade Mangum Demi Lovato Photo: MTV News Source:
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