Actress Nayanthara has signed on to star in a horror movie to be directed by debutant Ashwin. The film is being bankrolled by KE Gnanavelraja of Studio Green and even has Nedunchalai actor Aari in a ‘crucial role’. Nayanthara is currently busy finishing up the remaining portions of Idhu Namma Aalu, Thani Oruvan and Nanbenda, post which she will begin work on this project. Sources tell us that she will also star opposite actor Suriya in the Venkat Prabhu horror comedy to be produced by Studio Green.