The two actors, who play brothers in upcoming Yash Raj project Mere Brother Ki Dulhan, are not on speaking terms, claims Mid Day.
A source told the newspaper: "Imran is the lead actor in the film. But then he started hearing that Ali was promoting himself as the lead. Not one to react to hearsay, Imran started getting irritated when people close to him also started questioning if he was indeed the lead actor."
Pakistani musician Zafar, who made his debut in the comedy Tere Bin Laden, is said to have let the commercial success of his first project impact his work in the film industry.
"Ali was painting him as an English-speaking actor and promoting himself as a favourite with the masses. Even though he's just one film old, he's been acting like a star while Khan is totally down-to-earth," the source added.
The project, which also stars Katrina Kaif, has been shot across northern India.
