Kajol and Rani Mukerji are Karan Johar's lucky mascots and must make an appearance in every film that he makes. It's no different in his latest "Kabhi Alvida Naa Kehna".

According to insiders, Kajol will appear in a song along with Amitabh and Abhishek Bachchan in the much anticipated film that stars Shah Rukh Khan, Preity Zinta and Rani.

The special song is scheduled to be shot in July with the other three key players in the film.

Earlier, Rani and a pregnant Kajol appeared fleetingly in the very popular "Mahi Ve" song in Johar's love story "Kal Ho Naa Ho" with Shah Rukh, Saif Ali Khan and Preity.