From Stephen Chbosky’s book to the big screen, the trailer for The Perks of Being a Wallflower is here! And it stars none other than Emma Watson, all grown up and working an American accent for her first big post-Potter role. The actress—who’s slowly growing out her famous crop, as seen at the MTV Movie Awards last night—plays Sam, a Rocky Horror-loving senior who befriends the titular wallflower, Charlie (Logan Lerman). The film also stars The Vampire Diaries Nina Dobrev as Charlie’s sister and Paul Rudd as an English teacher. Watch the full trailer above! The movie hits theaters September 14th.

Plus, see more of our favorite book-to-big screen adaptations in the gallery!

FROM BOOKS TO MOVIES!

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The Most Memorable Movie Princesses of All Time