The family drama stars a stellar cast including Amitabh Bachchan, Jaya Bachchan, Shah Rukh, Kajol, Hrithik Roshan and Kareena Kapoor.
"12 years of K3G, my dad's favourite movie...he always cried when he saw it, and said 'Shah Rukh and Amitabh Bachchan reminded him of his dad and him'," Karan shared on microblogging site Twitter Saturday.
Shah Rukh, who played Rahul in the movie, had a lot of people to thank.
"This one has a big thank you list...Amit ji, Jaya ji, Hrithik, Kareena, Kajol, Yashji, Faridaji (Farida Jalal), grannies, fainting Karan and all phew! 'K3G'- a dozen years," tweeted the superstar.
The film released Dec 14, 2001. It spoke about family values and the tragic feeling of loss when loved ones part ways. Based on relationships, the movie was loved both in India and overseas as well.