Krishnan took to her Instagram, where she and Bachchan are seen taking a selfie on the sets dressed in their costumes from the upcoming magnum opus, Krishnan wrote: "Ash" with a hug emoji.
Ponniyin Selvan also features actors like Vikram, Karthi, Jayam Ravi, Jayaram, Parthiban, Lal, Vikram Prabhu, Jayaram, Prabhu and Prakash Raj.
The film, whose first part is scheduled to open on September 30, is a story that revolves around the early life of prince Arulmozhi Varman, who later on went on to be known as the great Raja Chozhan. In the movie, Bachchan will reportedly be seen in a double role. She will be seen playing the role of queen Nandini and Mandakini Devi.