Megastar Amitabh Bachchan is a proud daddy. Revelling in the box office success of his son Abhishek's "Dhoom 3", he says he "never imagined" his boy would become the star that he is today.

The 71-year-old posted a childhood picture of Abhishek Bachchan on Twitter.

`Abhishek on rare Sunday at Prateeksha, never imagined he would become what he is today...'Dhoom 3',` Amitabh posted on the microblogging site Tuesday.

"Dhoom 3" has grossed Rs.107.61 crore in the first three days of its release, including earnings from the Tamil and Telugu versions. Produced by Aditya Chopra, the film also features Aamir Khan, Uday Chopra and Katrina Kaif.