It's going to be a double treat for the mega fans soon. First - the audio launch of Pawan Kalyan's Sardaar Gabbar Singh' and 'secondly, the three mega brothers would be seen together after a long time at the audio launch of the film. Sardar Gabbar Singh's producers have requested Mega Star Chiranjeevi and Mega brother Nagu Babu to be the chief guests at the audio launch of their film.