The 45-year-old filmmaker said he can easily recall actors on his sets falling in love "more than five times".
"Yes, it happens all the time. It has happened more than five times, I can assure you. People fall in love, it's the industry of love," Karan said.
The director added the off-screen romance has never interfered in the making a film but has only "enhanced it".
"In fact, if they fall in love it's great. If it's legit and lovely... it's fine. Even if it's not, it's their problem."
The filmmaker was speaking at the launch of his radio show, "Calling Karan" for Ishq FM.
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