It has been revealed that nation's little sister, has been hiding her curvy figure.A photo titled 'IU out of the blue' recently surfaced on the web. The photo was taken of the singer during one of her individual concert dates.What drew attention to the picture however, was the star's somewhat revealing outfit. Rocking a black tanktop with a deep neckline and showing off her unexpected volume, IU drew in the eyes of many fans.Her wavy hair and natural make-up finished off the overall look.Netizens responded saying, "A surprising side of IU", "Such unexpected volume", "IU has everything", and more.Source + Image: Tv Report via Nate