Which Bollywood star had slapped Varun Dhawan once?

Varun Dhawan, though has been a gentleman and has the reputation of being a well-behaved star, controversies have chased him no less. A new star was born on the horizon of Bollywood, when his Student of the Year was released. His acting and dancing caliber were appreciated. But the journey in Bollywood has its share of some harsh realities also and knowingly or unknowingly they are dragged in some controversy or the other. Let's have a look at these controversies: