Basu posted a video on Twitter that showed the actress, armed with a smile, trying to give the filmmaker a new look with a razor.
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Though she seemed happy to do it, he looked tense about Katrina taking charge of the razor. Someone can be even heard saying: "Stay still".
The "Barfi!" director captioned the video, which he tweeted on Saturday: "Katrina! The only thing that will save that haircut now is an invisibility cloak."
"Jagga Jasoos", also starring Ranbir Kapoor, is a comedy-drama film which tells the story of a teenage detective in search of his missing father.
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It is set to release on April 7.
ANI