Mr Bachchan and Waheeda Rehman have worked together in films like Kabhie Kabhie and Trishul.
Big B met Ms Rehman at a book launch event in Mumbai.
This is what Mr Bachchan wrote on his official blog:
"And then the lovely Waheeda Rehman, my favourite from the time I started seeing cinema. And her childlike mischievous banter, resonant from the time I met her 45 years ago, and then through films that I did with her - Reshma Shera, Kabhi Kabhie, Adalat and Trishul and so many other," Big B wrote on his official blog.
Mr Bachchan also shared a few images with Ms Rehman on his blog.
"Still with Waheeda ji and sharing a little personal moment, which harps on the presence of some guests and their...well ... never mind," he added.
The Piku actor also wrote about filmmaker Vidhu Vinod Chopra, who has co-produced Mr Bachchan's upcoming film Wazir. Mr Chopra also attended the event.
"Vidhu Vinod Chopra and his continued connect with his films even in the most non film like environment, showing me the publicity material for Wazir," said Big B.
Wazir, which also features Farhan Akhtar, is scheduled to release on December 4.