One chat to rule them all.

Dominic Monaghan has offered a rare peek inside the private group chat he shares with his “Lord of the Rings” co-stars, and what the four Hobbits are actually texting about more than two decades after saving Middle-earth.

Monaghan, who played the ever-loyal Merry Brandybuck in Peter Jackson’s Oscar-winning trilogy, revealed that the actors still keep multiple threads going, including one exclusively for the Shire’s finest.

The other three members of the tight-knit Hobbit fellowship include Elijah Wood (Frodo Baggins), Sean Astin (Samwise Gamgee) and Billy Boyd (Pippin Took), all of whom have remained famously close since filming wrapped on the early-2000s fantasy epic.

“We have different text chains. That one is just called Shire Folk, and that’s just full of

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