Diljit Dosanjh also won the best debut actor male for the same film.
Both Shahid and Alia were emotional about winning the award for a film which made its way to the big screen after fighting the censor board, and let mainstream performers like them take up something risky.
Diljit too thanked his fans for support in a Twitter post.
“Love my fans. Guys this is all because of you. Thanks team IIFA and ‘Udta Punjab’,” he tweeted.