Dwayne Johnson surprises young fan with lunch.

Unexpectedly stopping by a teenage fan who is battling a rare bone cancer was Dwayne ,

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"The Rock" Johnson.What transpired: In a video he shared on Sunday,

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Johnson describes how a teenage admirer of his named Luna Perrone (@luna_perrone),

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who has battled bone cancer for years, just heard that it had spread. Johnson had arranged ,

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She is a great fan of mine. I'm her biggest supporter. Before the surprise,

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