After season 3, 4 and 5, Anushka had reportedly refused to be on 'Koffee With Karan' because she didn't want to publicly discuss about her relationship with Virat Kohli on the show's set.
The closest friend of Karan, SRK has appeared on almost all seasons of 'Koffee With Karan', except season 4. He was reportedly hurt or angry as Karan chose Salman for the first episode and not him.
Initially, Salman had rejectd the idea, but after a lot of coaxing by Karan Johar, he finally appeared on 'Koffee With Karan's' season 4. Reason was, he wanted to avoid Karan’s unanswerable questions.
We had seen Akshay and Twinkle on the show's season 5. However, the duo used to refuse for appearing on the show to avoid controversies. In Akshay's words, he can't clarify things those being said.
At the end of the show, Karan was also heard saying, "I don't know why I have dug this grave for myself by calling you guys on the show tonight."
Aamir had appeared on the shows's season 4 along with his ex-wife, Kiran Rao and we got to see the 'un-reserved' side of him, which he was initially not interested in opening up.
Despite appearing on the season 2, she refused afterwards as allegedly she wasn't ready to answer Karan's questions about her break-up with Ranbir Kapoor and many more.
When Juhi appeared on 'Koffee With Karan's' season 4, she alleged Karan for not inviting her earlier. To this, Karan said she had reservations for her partner on the show and denied the allegations.
This time, for season 7 of the show, Ranbir has entirely refused Karan. The actor said he don't want to fall in trouble after saying anything on the sets, instead he wished to go to Karan's home.