As a treat for her fans, Kajol will launch the trailer of her forthcoming film Helicopter Eela on her birthday on Sunday.

Directed by Pradeep Sarkar, the film also stars the National Award-winning actor, Riddhi Sen, who will be playing Kajol's son.

Written by Mitesh Shah, Helicopter Eela will see Kajol playing a single mother and an aspiring singer. The film is co-produced by Ajay Devgn and Jayantilal Gada of Pen India Ltd. It is slated for release on September 7.

The trailer will be released in the presence of her husband, actor-producer Ajay, and co-star Riddhi along with Sarkar.

In an interview earlier this year, Kajol described the film as 'sweet and funny'.