On Friday night's episode of the Late Show With David Letterman, the glammed-out Toronto synthpopper Diamond Rings made an appearance, performing the anthemic recent single "I'm Just Me." John O'Regan, you will probably not be shocked to learn, has stage presence to burn. Letterman: "Don't look at them lasers!" Watch it below. [videoembed size="full_width" alignment="center"][/videoembed] Diamond Rings' new album Special ...