Amitabh Bachchan's Diwali Bash
Amitabh Bachchan invited many guests for Diwali bash at his residence, JalsaVarinder Chawla

Bollywood megastar Amitabh Bachchan's upcoming film "Do" has been re-named and is now officially titled "Wazir".

Big B's co-star Farhan Akhtar took to Twitter to announce the change in the film's title. However, the reason for the title change is unknown.

Directed by Bejoy Nambiar, the plot of "Wazir" revolves around an ailing wheel-chair stricken chess master, played by Big B, while Farhan portrays the role of a tough Anti Terrorist Squad (ATS) officer.

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Sr Bachchan had recently shared a picture from the film on his Facebook page. In the photo, both the actors are seen sipping a cup of coffee amidst the beautiful location of Hauz Khas, New Delhi.

There were reports that the team will shoot major portions of the film in New Delhi, including India Gate and Jama Masjid.

Apparently, the "Bhaag Milkha Bhaag" star has put on around eight kilos to get into the skin of the challenging role he portrays in the film. 

Produced by Vidhu Vinod Chopra, "Wazir" is an intense drama, which also stars Aditi Rao Hydari. 

Incidentally, Farhan will also be playing as a cop in Shah Rukh Khan starrer "Raees" and will next be seen in his sister Zoya Akhtar's "Dil Dhadakne Do", which is based on a dysfunctional Punjabi family.

The actor has been paired opposite Priyanka Chopra in "Dil Dhadakne Do" and is set to release worldwide on 5 June 2015.