Before he took off for the US, Aamir Khan visited the sets of 'Kaun Banega Crorepati'

As he was also shooting for 'Dhoom 3' at Yashraj Studio, Amitabh Bachchan requested him to pay a visit to meet his fans on the sets.

Also..

The Big B was among the first to watch the theatrical trailer of Dhoom 3. He was specially invited for a screening by producer Aditya Chopra.

The veteran star states on the microblogging site Twitter, `Adi Chopra calls me to his preview theater to view the first trailer of 'Dhoom 3'.. astoundin !! Such finesse!!`

The theatrical trailer releases today in IMAX format.