Karan Johar's 'Kabhi Alvida Na Kehna' was leaked to media by some fans while shooting in New York. They canned some pictures and circulated them with the brief outline of the story. Karan was so upset because when you're working with huge stars like Amitabh and Abhishek Bachchan, Shah Rukh Khan, Rani Mukherjee and other, the stakes are high.