Mumbai, August 5 (IANS) Bollywood star Kajol appears to have kicked off her 52nd birthday on a healthy note. Alongside the picture, she wrote, "First and most useful gift of the day #birthdayvibes grammar is forgiven today since it's the #specialday." Adding to the birthday cheer, Kajol's younger sister, actress Tanishaa Mukherji, shared a candid picture of the two laughing together. Wishing her sister through the post on her social media account, Tanishaa wrote, "My darling Kaddy may we always be laughing through life! On the work front, Kajol was last seen in the mythological horror film Maa, where she played a fiercely protective mother.