Kalank: Alia Bhatt reveals secret behind the 'crackling on-screen chemistry' with Varun Dhawan

The bond and comfort they share in real life is the key to their crackling chemistry on screen, say actors Alia Bhatt and Varun Dhawan. The duo made their debut with 2012's "Student of the Year" and went on to star opposite each other in "Humpty Sharma Ki Dulhania" and "Badrinath Ki Dulhania".

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