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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