[HQ PICS] From Katrina Kaif, Vicky Kaushal to Ananya Panday and Kartik Aaryan, B-town celebs attend Karan Johar's birthday bash

Karan Johar is a celebrated filmmaker in Bollywood and there are no two ways about it. He made his directorial debut with Kuch Kuch Hota Hai featuring Shah Rukh Khan and Kajol.