Cousins Kareena Kapoor and Ranbir Kapoor will share the platform on singing reality show 'Indian Idol 6' to promote their respective films

Kareena will be spreading a word about her much awaited film 'Heroine', while cousin Ranbir will promote his movie 'Barfi'. "Kareena and Ranbir both will be coming for the grand finale of 'Indian Idol 6' on August 31," sources said.

Kareena plays the part of a superstar Mahi, in Bhandarkar's 'Heroine'. The film releases on September 21. 'Barfi' is a romantic comedy directed by Anurag Basu, revolving around Murphy (Ranbir) whom everyone calls Barfi.

Always ready with a prank, he is quite a charmer even though he can neither speak nor listen. Priyanka Chopra plays an autistic character, Jhilmil, in the film. Set to release on September 14, the film also features Tollywood actress Ileana D'Cruz.

There is also a buzz in B-town that Kareena and Ranbir would be seen together for the first time on silver screen in Zoya Akhtar's project. The real life cousins would play reel life siblings in the film.