Celebrities like Varun Dhawan, Bipasha Basu, Dia Mirza and have wished Karan Johar, who turned 44 on Wednesday, a very happy birthday!

The son of acclaimed producer Yash Johar made his directorial debut in 1998 with the blockbuster romance 'Kuch Kuch Hota Hai', starring Shah Rukh Khan, Kajol and Rani Mukerji. He went on to make drama films like 'Kabhi Khushi Kabhie Gham...' and 'Kabhi Alvida Naa Kehna'.