The actors were shooting a "madcap" action sequence in an as-yet-untitled film with Khan when he accidentally hit on the face with a gun, the Times of India has reported.
In an interview with the paper, Kaif said: "Please don't make it seem as if Imran was careless or something. These things happen.
"We were shooting one of the really madcap scenes where the actors' limbs acquire a life of their own."
She said it was the second time it had happened while shooting a film - Kaif was last whacked in the face by Ranbir Kapoor in Ajab Prem Ki Ghazab Kahani.
