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Check Out Rob Gronkowski's Tab From Partying This Weekend

New England Patriots tight end ROB GRONKOWSKI work hard on the field... Which is probably why he parties even harder when he's off of it!

Here's what Gronk got into this last weekend.  He partied with 20 of his buds at a nightclub called Shrine at the Foxwoods Resort Casino in Connecticut and they racked up a massive $102,407 tab! Here's what makes it even more impressive... that's BEFORE gratuity!

TMZ published a receipt, and a rep from Shrine says it's real.

The bill includes 160 bottles of champagne -- plus 16 bottles of Grey Goose, 45 orders of Maker's Mark, 24 shots of Jim Beam Fire, and three bottles of Don Julio 1942.

TMZ also added that it's "likely" the casino footed the bill to have Gronk there, but Gronk could surely afford it.