Bachchan, Alia and Ranbir Kapoor are teaming up for the fantasy film, which is being produced by Karan Johar.
The movie will go on floors next month.
Asked if she was nervous while working with the megastar, the actor said, "Amit ji is such a warm person, he tries to make everyone feel comfortable. He won't intimidate intentionally, but of course you're working with a legend, so something will happen."
The "Badrinath ki Dulhania" actor was speaking at the red carpet of Zee Cine Awards here last night.
Asked about reports of her co-starring with Ranveer Singh in Rohit Shetty's "Simba", Alia responded saying, "I am starring opposite Ranveer in 'Gully Boy', which I am starting in January."
The actor, further, denied being in talks for "Simba".
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