Nagarjuna Akkineni's 100th film is the hottest topic in the tinsel town. When everyone was waiting for a grand announcement to be made, the project went on floors silently, much to the fans' surprise. And now, there's another interesting buzz that's doing the rounds about the most-anticipated project. According to industry sources, actress Tabu is on board for the milestone film. Directed by Ra Karthik, Nagarjuna's 100th film has already commenced shooting in Hyderabad. But the leading lady has always been a constant source of speculation.