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.
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'Brahmastra' will hit screens on August 15, 2019. (ANI)