Kajol and Tanishaa Mukerji's strong and solid bond is known to all. The sisters have now begun sharing their posts together on Instagram and Twitter. And because today is the little one's birthday, the big sister had to wish her on her social media account.

Taking to her Instagram account, she shared a throwback picture and wrote- "Hey You..... Happy happy birthday you sweet girl. Wish you the world." (sic) This was followed by a lot of hearts.