Film stars Amitabh Bachchan, Alia Bhatt and Ranbir Kapoor have started preparing for the next schedule of their much-anticipated film 'Brahmastra'.

The 'Raazi' star on Friday treated her fans and followers with a sneak peak.

In the picture, Big B, Alia and Ranbir are seen involved in a script reading session of the sci-fi drama with director Ayan Mukerji.

"Oh captain my captain! Prep with the legend @amitabhbachchan #brahmastra #ranbirkapoor," she captioned the picture.

Oh captain my captain! Prep with the legend @amitabhbachchan ❤️❤️❤️ #brahmastra #ranbirkapoor

A post shared by Alia ✨⭐️ (@aliaabhatt) on Jun 1, 2018 at 2:14am PDT

Amitabh Bachchan also shared picture on Twitter and wrote, "T 2824 - We prep for BRAHMASTRA .. Ayaan , Ranbir , Alia , .. all except moi .. I propagate brushing teeth .. .."

T 2824 - We prep for BRAHMASTRA .. Ayaan , Ranbir , Alia , .. all except moi .. I propagate brushing teeth .. .. pic.twitter.com/ujuUjnHhCT

— Amitabh Bachchan (@SrBachchan) June 1, 2018

'Brahmastra' will hit screens on August 15, 2019.