Saira shared the message and photograph through Dilip Kumar's Twitter account, which is operated by their family friend Faisal Farooqui.
"Message from Saira Banu: My Kohinoor, my sahab, the man of my dreams, my Yusuf jaan and I can't thank enough -- the millions of well-wishers, friends and family for your beautiful messages, calls and greetings on our 52 years of marriage today. Attaching a personal favourite photograph," read the tweet.
Dilip Kumar, 95, was admitted in a hospital here last week to get treated for recurrent pneumonia. He was discharged on Thursday, and has been advised complete rest and isolation for a few days to prevent infection.
(With inputs from agencies.)