Aptly titled "Happy Birthday", the song marks Varun's debut as a rapper. It starts with a birthday party for choreographer-actor Punit Pathak and then moves to behind-the-scenes of the "Badlapur" star rapping in a studio.
    
"#HappyBirthdayKaranJohar @karanjohar hope you have the most amazing year big hug. Wanna dedicate this song to you," he posted on Twitter.
    
Johar, who made his full-fledged acting debut this year with Anurag Kashyap's period drama "Bombay Velvet", was also wished by Alia and Sidharth.

Sidharth Malhotra: "Happy birthday @karanjohar thank you for being the way you are, love you for it, big hug”.
    
Alia Bhatt: "Happy birthday to my favourite @karanjohar !!!!! Love you love you to the stars and back."

Shraddha Kapoor:
“Happy birthday @karanjohar! Wish you never ending happiness, success & hit movies for life!"
    
Emraan Hashmi: "Happy birthday@karanjohar! Hope you have a fantastic year."
    
Shahid Kapoor: "Here's wishing @karanjohar a very happy bday. Have asuper year. Much love.

 

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