The actor was shooting for the short sequence and even posted the pictures on his blog. In the photographs, he was seen dancing to the tune of a dhol(drum) in a huge crowd.
"That's the day for me at a shoot for a small appearance in a film being made by Sanjay Dutt...a gesture to be alongside him in his hour of trying times," Bachchan posted on his blog srbachchan.tumblr.com Friday night.
The 71-year-old also added that once he is in front of the camera, he forgets everything and just performs.
"Despite all the discomfort of the body … when the camera rolls, the body rolls too ... I have just sufficient time to do just this for today ... but hopefully more will follow soon," he said.
As reports suggest, Big B will be playing himself in the film that is reportedly titled "Big B". Sanjay is currently serving a jail sentence in connection with the 1993 Mumbai bomb blasts.