Kangana flew to Los Angeles a few days ago for the measurements.
"This is how measurements for prosthetics are taken, it's not easy to be an actor, Kangana so calm even in something which is so suffocating for us to even watch ," the sister tweeted.
The producer of the film, Vishnu Vardhan Induri, had earlier revealed that renowned Hollywood artist, Jason Collins, who has worked on films like 'Blade Runner' and 'Captain Marvel', will be working on Kangana's look in the biopic.
Jaya: Hollywood Makeup Artist Roped In For Kangana Ranaut’s Jayalalithaa Biopic
The upcoming flick is being helmed by AL Vijay and produced by Induri and Shaailesh R Singh.
It is written by 'Baahubali' and 'The Dirty Picture' writers K.V. Vijayendra Prasad and Rajat Arora, respectively.
The biopic will be titled 'Thalaivi' in Tamil and Telegu while it will be called 'Jaya' in Hindi.
Kangana Ranaut: Criticism Doesn’t Make Me Bitter
Jayalalithaa served as the chief minister of Tamil Nadu for over 14 years and was an actor before entering politics. The AIADMK leader left countless supporters bereaved when she died in 2016 at the age of 68. (ANI)