Karan Johar turns 42: Bollywood celebs wish the birthday boy on Twitter!

B-town’s most loved director and producer Karan Johar turns 42 today. Karan Johar who is known for his successful directorial ventures such a ‘Kuch Kuch Hota Hai’, ‘Kabhi Alvida Na Kehna’, ‘My Name is Khan’ and ‘Student Of The Year‘, celebrated his birthday on Saturday night. Look what the film fraternity has to say about this multi-talented personality