When the Michael Jackson film, "This Is It," opens worldwide tomorrow, fans and naysayers will be able to judge for themselves whether the King of Pop still had the chops to perform.

Orianthi, the guitarist he picked to perform his London shows, told "Good Morning America" today that Jackson was "full of energy."

"On stage, he was keeping up with the 24-year-old dancers," she said. "He was up there, doing his thing. He wasn’t sitting in the corner and looking ill, not able to participate. He was on stage with everybody."

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