Karan Johar is an actor.
Karan Johar ( born 25 May 1972 ) , often informally referred to as KJo , is an Indian film director , producer , screenwriter , costume designer , actor and television personality who is primarily known for his work in Hindi films . His next two films were the ensemble dramas Kabhi Khushi Kabhie Gham ... ( 2001 ) and Kabhi Alvida Naa Kehna ( 2006 ) , which were both very successful in the overseas market .