The DUFF is a 2015 American coming-of-age teen-comedy film directed by Ari Sandel from a screenplay by Josh Cagan. Based on the 2010 novel of the same name by Kody Keplinger, it stars Mae Whitman, Robbie Amell, Bella Thorne, Bianca Santos, Skyler Samuels, Romany Malco, Ken Jeong, and Allison Janney. In the film, Bianca (Whitman) instigates a social makeover after finding out that she has been labeled "the DUFF" ("Designated Ugly Fat Friend") by her high-school classmates. In November 2011, CBS Films acquired the film rights to Keplinger's novel, and Cagan's then-unproduced screenplay featured on that year's Black List of best unproduced screenplays.