John Mayer was apparently so moved by Adam Driver’s shirtless scene in “The Last Jedi” that he’s cosplaying as the “Star Wars” villain on Instagram. Or he just wanted an excuse to post a gratuitous selfie. Fans of “The Last Jedi” will surely remember the moment when Kylo Ren (Driver) and Rey (Daisy Ridley) have a long psychic conversation while he’s in the middle of disrobing. Even Ridley’s character is so startled by his nakedness that she asks him to cover up.