It is said that it did not happen because of Kareena Kapoor and Priyanka Chopra's fight and infamous war of words on Karan Johar's TV show Koffee With Karan.
A source told a leading daily, "In the context of the Kapoor family being a part of Bollywood since the last 80 years, it's sad that Kareena and her cousin Ranbir have never appeared together on the stage ever. The makers of the show wanted to make this possible. Apparently at the last minute, it was decided that it could not go as planned."
The source further added, "Everyone realised that it would not be possible to get Kareena and Ranbir's co-star Priyanka Chopra on the same stage. That's why Ranbir shot his portions on Friday whereas Kareena went live on the show."
It seems that our Bollywood actresses believe in only one thing - Once an enemy always an enemy!