R&B superstar Rihanna has been cast in a new Dreamworks Animation film titled "Happy Smekday!," alongside "Big Bang Theory" star Jim Parsons.  The film is an adaptation of "The True Meaning of Smekday," an award-winning children's book from author Adam Rex.  The film will be the voiveover debut for Rihanna, who made her live-action debut in the film "Battleship," which hit theaters earlier this summer.  Tim JOhnson, who is directing "Happy Smekday!," hopes to have the film in theaters by the end of 2014.