The actress says her role - Kashibai - displays many emotions from simple and poetic to devoted.
Priyanka, who is currently staying here, also added that the look comes as a pre-Diwali gift for her fans.
`#KashiBaiPoster Simple... Poignant... Poetic... Sanguine... Devoted #somanyemotions,` Priyanka tweeted on Sunday.
The actress, who made her international TV debut with `Quantico" this year, went on to add that `Early Happy Diwali from cold Montreal. I miss home! Here is the first look of #KashiBaiPoster`.
Early Happy Diwali from cold Montreal. I miss home! Here is the first look of #KashiBaiPoster pic.twitter.com/gAEhpebwXU
— PRIYANKA (@priyankachopra) November 8, 2015
`Bajirao Mastani` narrates the love story of Maratha Peshwa Bajirao I (played by Ranveer Singh) and Mastani (Deepika Padukone). Priyanka plays Bajirao's first wife Kashibai.
In the poster, Priyanka can be seen standing with an 'aarti thali' in her hands and is seen in a Maharashtrian attire. The canvas of the image is a myriad of colours like orange and purple with an impression of palace and Marathas in the background.
The film, which is expected to be opulent and grand, is scheduled to release on December 18.