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'.

He was lauded for his counter-terrorism drama 'My Name Is Khan'. These, along with the several successful films he has produced under the Dharma Productions banner, have established him as one of the leading filmmakers in the Hindi film fraternity.

Currently, he is shooting for his upcoming film 'Ae Dil Hai Mushkil', which features actors Ranbir Kapoor, Aishwarya Rai Bachchan and Anushka Sharma in pivotal roles.

Here is what celebrities had to say: