Songstress�IU has endorsed clothing brand y'sb through several seasons. �After causing a stir with teaser photos, y'sb�unveiled�official prints of �their�2011 F/W Collection creating even more buzz. �As a treat for fans, a special behind-the scenes video was also recently released. IU has been making headlines for her new more-mature look. She does a wonderful job showcasing the stylish, yet still comfortable clothing.As evidenced in the BTS video, IU seems to have become more comfortable with the camera. �She is able to switch from cute and adorable to wordly in the same photoshoot. Watch her various transformations and the final Official photos below! [gallery] Do you like this more polished IU or do you missed her more child-like charms? Source for images: Newsis