South actress Rashmika Mandanna, who has worked with Amitabh Bachchan in 'Goodbye', says that she is grateful for having done the film with the Bollywood superstar. Taking to Instagram, the actress posted a picture of herself with Big B and wrote, "I still can't believe this is happening. Having done a film with sir, getting to talk to him, being able to share the same stage as him, talking about the same topics, getting to take a picture with him, my God!!

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