Revealed: Reason behind Ajay Devgn's fight with Karan Johar

Karan Johar and Kajol, who worked togeth er in a number of films including 'Kuch Kuch Hota Hai', 'Kabhi Kushi Kabhie Gham' and 'My Name Is Khan', have not been on talking terms since the last few months. The duo's friendship went sour following a row.