Shai Gilgeous-Alexander took a page out of J.R. Smith's book at the OKC Thunder's championship parade on Tuesday ... stripping off his shirt during the route while introducing fans to the Larry O'Brien trophy!!
The celebration went down in downtown Oklahoma City ... with folks hitting the streets to celebrate after the Thunder's 103-91 victory over the Pacers in Game 7 of the NBA Finals.
SGA -- who was named NBA Finals MVP -- was hyped to deliver the city's first-ever NBA championship .