Rob Gronkowski Dancing At Beyonce Concert -- Gronktastic Dance Moves (VIDEO)

The Rob Gronkowski dance train rolled into Massachusetts last night -- when the Patriots tight end hit up the Beyonce concert ... AND BROKE IT DOWN LIKE A PRO!!!

Gronk let the music take hold ... and danced harder than ever when the Queen Bey busted out her hit, "Partition."

Gronk spent some time in the V.I.P. section with roughly 6 friends -- including Pats owner Robert Kraft (but we're told RK left early).

And as hard as Gronk went during "Partition," we're told he absolutely lost his mind during "Drunk In Love"

Gronk seems to be on a concert tear -- just last week, the 25-year-old NFL superstar went to a Jennifer Lopez show in Connecticut and rocked out to "Jenny from the Block."

Fierce.