TV actor Siddharth Shukla, best known for his role in 'Balika Vadhu', has signed a three film deal with Karan Johar's production house and will make his debut in the upcoming film 'Humpty Sharma ki Dulhaniya'. Directed by Shashank Khaitan, the film stars Varun Dhawan and Alia Bhatt in the lead with Siddharth in an important role.