Mumbai, Sept. 5 -- On the occasion of Teacher's Day, filmmaker Karan Johar penned a note of gratitude for actors Alia Bhatt, Varun Dhawan and Sidharth Malhotra.

In his note, he mentioned how his students, Alia, Varun, and Sidharth, "taught him more than they will ever know."

"They have taught me more than they will ever know (or I will give them credit for). Love to my students who inadvertently were also my teachers... @sidmalhotra @aliaabhatt @varundvn. #HappyTeachersDay," he captioned the post, uploading a poster of the film 'Student of the Year'.

Karan Johar launched Alia Bhatt, Varun Dhawan, and Sidharth Malhotra in Bollywood with his 2012 directorial Student of the Year and has shared a close bond with all three ever since.

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