f(x)'s�Amber and 4minute's Hyuna revealed a surprising BFF sel-ca. Amber uploaded the photo through her me2day on May 18th, attaching the caption, "Since HyunA's telling me to take a photo together, I can't say no." In the photo, Amber and Hyuna are seen gazing at the camera with cute expressions on their faces. Netizens gushed over the sel-ca, as they wrote, "Both of them are complete goddesses", "Even if she's boyish, is it impossible to hide her beauty?", and "The two of them look good together". f(x) is currently promoting 'Pinocchio' while 4minute is working on 'Heart to Heart'. Source: Osen via Nate