In pics: From Alia Bhatt to Aishwarya Rai, here's how Bollywood partied with Katy Perry in Mumbai 

The soiree hosted by Karan Johar saw the who's who of Bollywood in attendance from Alia Bhatt and Anushka Sharma to Aishwarya Rai and Ananya Panday. The American singer-songwriter is in India for the OnePlus Music Festival.