Karan shared a photograph of his late father along with Shah Rukh on Tuesday, holding hands from a press conference of 1998 film "Duplicate", on Twitter, and captioned it: "Papa and @iamsrk....#memoriesforever".
The Bollywood 'badshah' then retweeted the photograph, and wrote: "Oh how I miss my friends who are gone... love you Tom Uncle and miss you most."
Yash Johar died in June 2004 following a chest infection. After his death, his son Karan took over their production banner Dharma Productions.
Shah Rukh and Karan have been thick friends and have worked together for many films like "Kuch Kuch Hota Hai" and "Kabhi Alvida Naa Kehna". The two last worked together as actor-director in "My Name Is Khan" in 2010.