New Delhi, April 10 -- Bollywood has always shared a special equation with south Indian film industries, and vice versa. But it's interesting to see the frequency with which the mutual exchange of talents has been taking place lately. A fresh case in point being: Alia Bhatt and Ajay Devgn will be seen in SS Rajamouli's RRR that has Jr NTR and Ram Charan in lead roles. Apart from that, Amitabh Bachchan is currently busy with Tamilvanan's Tamil-hindi bilingual, Tera Yaar Hoon Main also starring SJ Suryah and Ramya Krishnan....