Amitabh Bachchan has reunited with his ‘Kabhi Khushi Kabhie Gham’ co-star Kajol, as he shot for a cameo in the actress’ upcoming release ‘Helicopter Eela’. Big B agreed to play himself in the movie, which is directed by Pradeep Sarkar. Being a thorough professional that he is, Bachchan shot for the cameo in a single day. ‘Helicopter Eela’ is based on Anand Gandhi’s Gujarati play ‘Beta Kaagdo’ and also stars Neha Dhupia. The film, which talks about single mother Kajol and her parenting ways, is produced by Ajay Devgn and Jayantilal Gada. ‘Helicopter Eela’ is scheduled to release on September 7.