Megastar Amitabh Bachchan, who will be seen doing a cameo in filmmaker R. Balki's upcoming film "Ki & Ka", says the trailer of the film looks "cool, fun and progressive".

"Ki & Ka", which stars actors Kareena Kapoor Khan and Arjun Kapoor in the lead, is based on the life of a young, married couple whose relationship challenges the gender roles placed upon women and men in Indian society.

"Next Balki film 'Ki & Ka' trailer... With Kareena and Arjun... Cool, fun and progressive... haha," Amitabh posted on Twitter on Wednesday.

In return, Arjun tweeted: "The three correct adjectives to describe you more than #KiAndKa ! Thank you for the love Amit Uncle".

In the film Arjun will be seen playing a house husband, while Kareena will play an ambitious marketing manager.

"Ki & Ka", which is slated to release on April 1, is Balki's first film in which the "Piku" actor will not be playing the lead.

They have previously worked together in films like "Cheeni Kum", "Paa" and "Shamitabh".