The Insider.com

Demi Lovato has performed in front of music's biggest names and sells out stadiums faster than you can TwitPic -- but the singer was wracked with nerves when her show was simplified to fit on a flatbed truck!

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Demi recently threw an impromptu show as part of the Starburst Presents VEVO GO Shows series and TheInsider.com has your exclusive first look at the mini-concert!

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Watch as a nervous Demi slays her new single Give Your Heart A Break, and be sure to check out Starburst's Facebook page on Thursday -- and VEVO on Friday -- to watch the entire performance!