Ed Sheeran Explained What Converted Him Into A Boston Celtics Fan, And Reneé Rapp Was Involved Ed Sheeran headlined the Boston Calling Music Festival 2024 and attended a Boston Celtics game with fellow performer Reneé Rapp, which led him to declare himself a Celtics fan.  Sheeran, who previously had limited basketball knowledge, received a crash course in the game from Rapp during the game.  The viral video of Rapp explaining basketball to Sheeran has delighted fans. Sheeran's decision to support the Celtics, a successful team, is seen as a logical choice, as they are set to compete in the 2024 NBA Finals against the Dallas Mavericks. “I’d only ever been to two basketball games before,” Sheeran said on the newest episode of Therapuss With Jake Shane. “One was a Celtics-Knicks game, and one was a Knicks [versus] someone else, so I haven’t really found a team. And then, yesterday, I saw all this green around and all these sort of Irish symbols, and I was like, ‘Well, yeah, I guess I’m a Celtics fan now.'” Who are you cheering on during the 2024 NBA Finals?