Rob Gronkowski — AIR GUITAR WITH SIR PAUL … Live in Concert! (VIDEO)

Happiness is a warm Gronk.  Paul McCartney invited a MASSIVE guest onstage at his concert at Fenway Park on Sunday — Rob Gronkowski — and dude went insane!!! The Pats tight end completely ROCKED OUT during “Helter Skelter” — we’re talkin’ air…

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