Based on the novel by Stephen Chbosky, who also wrote and directed the big-screen adaptation, "Perks" follows a group of misfit students -- Logan Lerman, Ezra Miller and, of course, Watson -- as they attempt to find their place within the high-school stratosphere.
The film marks Watson's first big role since "Harry Potter" (and without her British lilt!). She will next take the lead in Sofia Coppola's upcoming, "The Bling Ring."
You can take a look at all the exclusive "Perks" photos below.
"Perks of Being a Wallflower," which also stars Kate Walsh, Dylan McDermott, Mae Whitman and Melanie Lynsky, hits theaters September 21. Be sure to check out "Perks'" Facebook page every Wednesday for new images and quotes from book and film (fans can even submit their own original artwork, which may be featured on the film's Tumblr). Today's quote is "Right now, we are alive. And in this moment, I swear we are infinite."