After "Dangal," Aamir Khan will collaborate with his wife Kiran Rao's next, which she is keeping under wraps. Aamir featured in Kiran's first film, "Dhobi Ghat," and now, the superstar is set to appear in her second directorial.

According to a DNA report, Aamir will make a special appearance in the movie. However, the makers don't want to disclose any detail about Kiran's film, but a source has revealed the plot of the story. "Kiran has been shooting quietly for a film called 'Begum Aapa' at Filmalaya Studios in Andheri for the last month-and-a-half. It's being produced by husband Aamir Khan's production company," a source told the leading daily.

"Begum Aapa" will be about an elderly woman and her relationship with a bunch of kids and it is said that all the members connected with the project have signed a non-disclosure agreement. "It's an interesting and unique story which is why probably Kiran wants to keep it under wraps for the moment till she completes shooting for the film. It's a start-to-finish schedule," DNA quoted an insider as saying.

Earlier, it had been reported that Aamir might also do a special appearance in Anil Kapoor's TV series, "24" season 2. Aamir and Anil share a great bond and fans were excited to see them together on a small screen. However, later, the reports were rubbished.

After "Bombay Talkies," Aamir will be seen in a cameo in his wife's film. At present, the actor is busy with his upcoming flick, "Dangal." The sports-drama is set to hit the theatres on Dec. 23 and also features Sakshi Tanwar, Fatima Sana Shaikh and Sanya Malhotra. Directed by Nitesh Tiwari, it is a biopic on senior Olympics coach Mahavir Singh Phogat.