New England Pats -- Champagne Chuggin' After-party ... Brady Out, Garoppolo In

How close are the New England Patriots??? Well, they don't mind swappin' a little spit ... 'cause they chugged champagne together at an afterparty ... and TMZ Sports has the pics.

After raging at the Super Bowl ring celebration at Robert Kraft's house last night, a bunch of the guys kept the party train rollin' to Cure Lounge in Boston -- where they raged 'til 2AM.

Among the partiers ... Gronk, Julian Edelman, Danny Amendola, LaGarrette Blount, Malcolm Butler and Jonas Gray.

But the most interesting part ... Tom Brady decided to tap out after the main party -- so his backup Jimmy Garoppolo represented for the QBs instead.

We're told the gang popped a $7,500 bottle of Belaire Rose -- Rick Ross' stuff -- and passed it around like blame in a Deflategate investigation.