Channing Tatum made a splash joining Taylor Swift’s A-list squad … popping up at her Rhode Island holiday home as the celebrity beach party raged on.

Channing was spotted enjoying some solo time on the wraparound balcony of the $17 million beachfront place Monday … taking in the view of the private beach and snapping some pics of the scene.

Later, he linked up with everyone else at the 8-bed mansion … and was seen chilling with Blake Lively, Ryan Reynolds, and Taylor’s boo, Travis Kelce.

The celeb gang … including Bradley Cooper, Patrick and Brittany Mahomes … got together for Blake’s 37th birthday over the weekend … with TMZ snagging the first pics of Taylor and Travis chilling at the pad Saturday.

Blake’s crew came through for her big time … especially after all the drama with her and Justin Baldoni over their recent flick, “It Ends With Us.”