Kalank Teaser Launch: Karan Johar shares how Kalank is so special.The teaser of Kalank, co-starring Alia Bhatt, Varun Dhawan, Aditya Roy Kapur, Sonakshi Sinha, Madhuri Dixit and Sanjay Dutt, is finally out! Filmmaker and producer Karan Johar has taken to the stage moments before the teaser launch. He had earlier shared how special the film, which has been in his heart and mind for over 15 years now, is to him as Kalank was the last project his dad, Yash Johar, had worked on. Check out video.

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