Bachchan, who has worked with the "Kahaani" actress in "Paa", will be seen with her yet again in the drama-thriller "Te3n", which also stars Nawazuddin.
"It's always a joy to work with Vidya, and I was equally delighted to work with Nawaz whom I've always admired. He is a phenomenal talent," Bachchan told reporters here.
"Truly, we get to learn so much from artists like Vidya and Nawaz because they are this generation, and I am in great admiration and awe of all the artists in the younger generation," he said.
Bachchan, 73, stars in the film as John Biswas, a grandfather in pursuit of justice for eight years, while Siddiqui plays Father Martin Das, whose life was changed with the same crime that claimed the life of John's granddaughter.
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Vidya, 38, will be seen in a special appearance as the cop who swings into action when an identical crime is repeated eight years later.
The "Piku" star said he observes the young actors very closely because they bring certain freshness, which he hasn't seen in his career.
Filmmmaker Sujoy Ghosh is associated with "Te3n" as a creative director, and Bachchan said the "Kahaani" helmer had come up with another idea to him.
"He had actually come with another idea before. We were almost set to do. It was a film about Kerala and we had decided on the story and decided to go ahead, schedule our dates. One day they said they had another idea. It took me just a couple of seconds to say let's do this, and not the other one at the moment," he said.