This girl is a true chameleon; getting into the skin of the character so effortlessly that she leaves everyone dumbfounded with her transformation.

Now the beautiful, enigmatic and a powerhouse performer actress will soon be seen in Balaji and Milan Luthria's Once Upon a Time in Mumbaai.

As the film is set in the 70's era of romance, smuggling, cabaret and the mafia, it requires a woman with a liberated air; fearless and bold.

And if anyone could carry the part of Ajay Devgn's love interest, Rehana in the film, it's the bold and bohemian Bollywood diva.

Says director Milan Luthria, "Kangna lends herself because she has a great body which does not look vulgar and her face is chameleon-like -- she can change into different looks everyday. There is a lot of her in her character Rehana."

Kangna who worked hard on her look in the film studied the fads and trends rampant in the 70's not just in Bollywood but even in the West.

Adds a production source, "Kangna's costumes were designed by Manoshi Nath and Rushi Sharma. She has done a lot of research on her role in the film and even went on to sketch out a preferred hairdo's accessories costumes and the works for her look in the film."

Once Upon A Time in Mumbaai also starring Emraan Hashmi is all set to release worldwide on July 30.