Actress Tabu feels that her "Fitoor" co-actor Katrina Kaif is the most hard working actress she has ever worked with and admits to being amazed by Katrina's involvement in her work.

"I must say that Katrina is the most hardworking actress I've ever met, I've ever seen and worked with. We had only three days of shooting but the involvement with which she worked was amazing," said Tabu at the trailer launch of their film on Monday.

"Fitoor" is based on Charles Dickens' novel "Great Expectations" and as seen in the trailer, Tabu plays the role of the begum who is the hurdle that her daughter Firdaus (played by Katrina), has to cross to unite and reunite with her love Noor (played by Aditya Roy Kapur).

When Katrina was asked at the press conference about her "fitoor" (madness for something), Abhishek intervened: "She is just passionate about work. If you see her on the sets, you see that she has the maximum 'fitoor'. The manner in which she works and the dedication with which she listens and works, shows she has a afitoor' for work."

"On sets, she was always open-minded and she was always willing to push the envelope as far the performance was concerned and personally I'm very happy with the work that she has done in the film," he added.

The film also starring Lara Dutta and Rahul Bhatt among others, is scheduled to release on February 12.