Though Kareena Kapoor and Kajol had once shared screen space in ‘Kabhie Khushi Kabhie Gham', Kareena is still feeling shaky in acting alongside versatile Kajol in ‘Stepmom'. She is taking acting lessons quietly with the director of the film Siddharth Malhotra. Kareena also feels that the character that she is going to portray is very difficult and she needs proper training. “The last time I rehearsed for a part was for Vishal Bharadwaj's Omkara. But that was a more unconventional film and role where I had to get into a milieu and character I knew nothing about. But Stepmom is urban and very contemporary. I play a very normal metro-centric working girl,” said Kareena. The film is inspired by director Chris Columbus hit drama Stepmom and Kareena Kapoor is going to play the role which Julia Roberts had portrayed. The shooting of the film will start by October end. __