Demi Lovato Performs '29' & 'Substance' During 'The Tonight Show' Take Over - Watch!

Demi Lovato took over The Tonight Show with host Jimmy Fallon this week.
The 29-year-old musician’s appearances all lead up to the release of her brand new album, Holy Fvck.
During her week long stops on the studio stage, Demi co-hosted the show next to Jimmy, and also gave two performances of her most-talked about tracks from the album: “29″ and “Substance”.
Demi also opened up about going back on tour.
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