In the adorable post, Sara described her brother as her number '1 boy'.
"Happiest Birthday to my (not so) little IGGY potter," Sara wrote.
"The day you were born I knew I wouldn’t be moms #1 child, and now post Fuffy Singh I’m happy that you’re not the superlative either. Regardless, you’ll always be my #1 boy," she said.
Sara and Ibrahim are the children of Bollywood actors Saif Ali Khan and Amrita Singh.
The image is also interesting as it gives a glimpse into the room of the Bollywood beauty Sara and her brother.
Sara was last seen in the movie Atrangi Re.