The 24-year-old who has a thin frame was initially reluctant to wear a bikini saying she was apprehensive about her weight, but was later convinced by Dhawan.
Kangana will be seen wearing a white bikini. The comedy flick also stars Ajay Devgn and Sanjay Dutt.
The duo will play two competing con men who try to outwit each other to win the heart of Kangana.
The movie is slated for a Dusshera release on October 6.
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