The film, directed by Rakeysh Omprakash Mehra, features Farhan Akhtar as ace athlete Milkha Singh, while Divya plays his sister.
"Just back from watching 'Bhaag Milkha Bhaag'! So proud that I'm an integral part of this beautiful film," Divya posted on Twitter Wednesday after a special screening of the film.
"Thanks Rakeysh Mehra for making such an inspiring film and Farhan you are something else! It's a great feeling to laugh, smile, cry watching your own film. This one is truly special for me," she added.
The movie releases Friday.