Asked about the prospect of Abhishek marrying Rai, the superstar quipped "I have also heard about it. You should ask the people who spread the rumour."
He said all that it mattered to him was that "it should be a good girl and it should be of his (Abhishek's) choice."
On his experience of working with his son in films like Sarkar, Bunty and Bubli and Kabhi Alvida Na Kahena, Bachchan said it was quite good. "He is quite competent."
"At home we are father and son but when we are before the camera, we are two actors. On the sets I have never seen him as my son but as a friend," he told.
Umrao Jaan starring Abhishek Bachchan and Aishwarya Rai was released last week, while Dhoom II is awaiting release.