Watch the Trailer for 'A Simple Favor' Starring Blake Lively and Anna Kendrick

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Director Paul Feig might be renowned for his comedic work like Bridesmaids and Freaks and Geeks but he's tapping into his darker side with A Simple Favor, a new thriller starring Blake Lively and Anna Kendrick. 

Check out the trailer below and get ready for it to hit theaters on September 14.