Can never feel 100 per cent secure in showbiz: Katrina Kaif

With films such as Rajneeti, Ek Tha Tiger, Dhoom 3 and Tiger Zinda Hai to her credit, she may have become one of the biggest female stars in Bollywood, but Katrina Kaif says it is tough to feel completely "secure" in movie business.

Katrina believes film industry is changing rapidly and to stay relevant one needs to explore new arenas in the showbiz.

"I don't think you can ever feel 100 per cent accomplished and secure in your career because it is a rapidly changing industry. Things are changing so quickly. But now I do feel comfortable and confident here," Katrina says.

"I have had a career that has been successful. Going ahead, you have to put in that much hardwork, keep performing and keep doing films in new spaces that are not only challenging but also interesting to audience," she adds. Katrina reveals she is working on few original concepts and scripts.

Her last release Tiger Zinda Hai, opposite Salman Khan, was a blockbuster and earned over Rs 545 crore worldwide. In her next two films, Zero and Thugs of Hindostan, the actor has teamed up one again with Shah Rukh Khan and Aamir Khan, respectively.

Looking back at the year, Katrina says, it has been "fulfilling and gratifying for me". "This year has been really good for me, Tiger Zinda Hai did very well and it was a new film for the audience and people appreciated it. It feels great that 'Tiger' franchise continues to be a success."

"Aanand L Rai's Zero is something on which I had a very

fulfilling experience.He really helps you. It was a good learning experience. And then I have Thugs of Hindostan with Aamir, Yash

Raj Films and Victor with whom I have worked on Dhoom 3. There is a definite possibility that both the films will step up... be the next level (in visual effects)," she adds.

There are rumours that Katrina will be seen in Rajneeti 2, Krrish 4, but she says, she has not been approached for any projects.