比安卡（梅·惠特曼 Mae Whitman 饰）是一个平凡的高中女生。在学校里，比安卡属于“其貌不扬”的那一类，对于这一点，她自己心里也很清楚。不过，比安卡的个性大大咧咧活泼开朗，身边聚集了麦迪森（贝拉·索恩 Bella Thorne 饰）、杰西卡（斯凯勒·塞缪尔斯 Skyler Samuels 饰）等一批笑话级的美女朋友们，这让比安卡的心里感到一丝安慰和自豪。 　　然而，让比安卡没有想到的是，这些美女们愿意和她待在一起的原因，仅仅是因为和她站在一起能够衬得她们更加的娇艳欲滴，和友情并无关系，得知了这一真相，比安卡崩溃了。比安卡找到了在校园里拥有高超人气的帅哥卫斯理（罗比·阿梅尔 Robbie Amell 饰），希望他能帮助自己改头换面。Bianca is a content high school senior whose world is shattered when she learns the student body knows her as 'The DUFF' (Designated Ugly Fat Friend) to her prettier, more popular friends. Now, despite the words of caution from her favorite teacher, she puts aside the potential distraction of her crush, Toby, and enlists Wesley, a slick but charming jock, to help reinvent herself. To save her senior year from turning into a total disaster, Bianca must find the confidence to overthrow the school's ruthless label maker Madison and remind everyone that no matter what people look or act like, we are all someone's DUFF.