"Sometimes work takes you away from moments that you really wish to be part of...like tonight Mr. Bachchan's 70th B'DAY celebration," tweeted Dia, who is in Jakarta for some work.
Amitabh turns 70 Thursday, but a special, star-studded celebration is set to witness the Who's Who of the film industry Wednesday night.
Dia finds the veteran actor "a great inspiration".
"My most memorable film with him is Shoojit Sircar's film ('Shoebite'). Can't wait for you to see it. Epic performance. The amount of work he packs in, his dedication, commitment and love for the craft is just unparalleled. RESPECT," she added.