f(x)'s Krystal looked casual and y for the May issue of 'CeCi' magazine. The theme was appropriately called 'Blue Confidential' as she donned denim in all of the pictures, showing off the great body line that earned her title of 'Denim Muse.'

Associate Editor Cha In Sun, who was present at the shoot, said, "The shoot did not show off iness that arises from excessive exposure of the skin or through purposeful directing, but rather iness from the energy that Krystal gives off."

Jessica and Krystal's reality show 'Jessica&Krystal' will premiere on May 6 at 11 PM KST!