Megastar Amitabh Bachchan has started shooting for director R. Balakrishnan's next and the look test for the film with American make-up expert Dominie Till took a lot of time.

`An arduous sitting for Balki's (Balakrishnan) look test with the lovely Dominie from L.A. that did my prosthetic make-up for 'Paa',` Amitabh posted on Twitter Thursday.

`It took time to be accomplished - the make-up I mean. It's 3:30 am! What? Off to bed,` he further posted.

The film also features `Raanjhanaa` star Dhanush and southern star Kamal Haasan's younger daughter Akshara.