Pulling double duty on "SNL" is no small feat, but these stars managed to host while also rocking the stage as musical guests—all in the same night! WatchMojo dives into some of the most memorable moments when top celebrities like Justin Timberlake, Lady Gaga, Ariana Grande, and more brought their A-game to Studio 8H, delivering laughs and chart-topping tunes alike. Which performance blew your mind the most?
