Kajol was born on August 5, 1975 in Mumbai. Her mother is the popular actress of yesteryears Tanuja who acted in Hindi films like Hathi Mera Sathi, Jewel Thief. The popular Bollywood actress Rani Mukherjee is her cousin. Her aunt Nutan and grandmother Shobhna Samarth were well known film actresses during their times.
At the age of 17 years she made her film debut as the leading lady in Bekhudi in 1992. The movie was not a success at the box office. Nevertheless, she went on to star in big banner movies. Her first big box office hit was Baazigar with Sharukh Khan. That movie gave Bollywood its new superhit on-screen couple. In 1995 she starred as Simran in the superhit Dilwale Dulhania Le Jayenge. Her movies Kuch Kuch Hota Hai (1998) and Kabhie Kushi Kabi Gam (2001) were major box office hits which made her number one heroine during that time.
For her stunning performances, she received the Filmfare award six times-in 1995, the Filmfare Best Actress Award for Dilwale Dulhania Le Jayenge, in 1997 the Best Villain Award for Gupt, the 1997 Filmfare Best Actress Award South for Minsaara Kanavu , the 1998 Filmfare Best Actress Award for Kuch Kuch Hota Hai, the 2001 Filmfare Best Actress Award for Kabhi Khushi Kabhie Gham and the 2006 Filmfare Best Actress Award for Fanaa .
She is married to movie star Ajay Devgan and they have a daughter. Kajol's next film to hit the theaters is Main Tum Aur Hum.