A new generation of celebrities is selling out concerts, starring in commercials, and amassing huge Instagram followings. But none of them exist—corporeally, anyway. In recent years, and starting in Japan, technology and social media have spawned a digital demimonde of computer-generated stars, ranging from fake musicians and models to company mascots who appear as holograms (like Betty Crocker, with AI). When they’re not entertaining you, they’re trying to convince you of their humanity, and even the more cartoonish among them have fleshed-out personalities. In a way, it’s the purest expression of celebrity, which has always been an elaborate illusion. CGI starlets, though, “are much easier to control,” says Ryan Detert, CEO of the branding firm Influential. Except when they misbehave.