Sharmila, who was often seen on the big screen with late actor Rajesh Khanna in movies like "Aradhana", "Amar Prem" and "Daag: A Poem of Love", turned 70 Monday.
The mother of actors Saif and Soha Ali Khan and designer Saba was one of the top Bollywood actresses who flaunted a bikini on screen in "An Evening In Paris".
"Sharmila Tagore is the most gorgeous 70-year-old I know. Happy birthday Rinkudi and have a super year," Shabana tweeted Monday.
The two actresses worked together in films like "Doosri Dulhan" and "Namkeen".
Actor Prosenjit Chatterjee too sent out birthday wishes, tweeting: "Happy Birthday to one of the most beautiful and gorgeous actresses Sharmila Aunty. Many many happy returns of the day. Love."