Bollywood actress Katrina Kaif has praised "Udta Punjab" calling it a "beautiful" film but said it is extremely tragic that the movie was leaked online.

The 32-year-old "Fitoor" actress, who watched the film at the special screening here last night, was impressed with the performances of Shahid Kapoor and Alia Bhatt.

"I thought it was a really outstanding film. Both Shahid and Alia have done an unbelievable job. Alia's performance is absolutely brilliant in the film. I think it is a beautiful movie," she told reporters.

"The director is passionate about the story he chose and he has done justice to it," Katrina added. The film stars Shahid as high-on-drugs rockstar Tommy Singh while Alia is seen as a Bihari migrant, who is an aspiring hockey player.

The Abhishek Chaubey-directed project, which was involved in a battle with the censor board, was leaked on the Internet two days before its release. Katrina says the incident is a big tragedy as an immense amount of hardwork has gone behind a film.

The actress joined other Bollywood celebrities including Aamir Khan, Karan Johar and filmmaker Anurag Kashyap, who appealed the audience to watch the movie only in theaters. "I think this is a big tragedy. There is an incredible amount of work which has gone into the film. When you will see the film, hopefully in the cinema hall, you will appreciate it. I would urge people to not watch it online."