Mumbai, June 25 (ANI): Bollywood actress Rani Mukerji who is all set to make her much-awaited comeback with a Yash Raj film launched the first look of her upcoming film Mardaani in Mumbai. The movie, which deals with the issue of child sex trafficking, will be her first post marriage film. The actress reportedly underwent an extensive training session to learn different techniques of Krav Maga, an Israeli martial art and self-defence system, as she is portraying the character of a strong female cop in the film. Mukerji, who played a courageous journalist in her last 'No One Killed Jessica' in 2011, believes in sending across a strong message through her all films. Directed by Pradeep Sarkar and produced by Aditya Chopra, the film will release worldwide on 22nd August, 2014.