Making Deepika Padukone sexy in front of the camera may not seem like a big challenge, seeing how beautiful the model-turned-actress is. But some of the credit does go to ace fashion designers, who style their beautiful outfits.

Designer Niharika Khan designed Deepika's outfits in Karthik Calling Karthik. She also designed her co-star Farhan Akhtar's outfits, giving him two looks in the film -- a stylish one, and a nerdy look.

Khan, who is designer Arjun Basin's sister, has worked with Farhan in films like Dil Chahta Hai and Rock On!! earlier.

She talks to Nithya Ramani about styling for Deepika and Farhan.

Tell us about the outfits you designed for Deepika and Farhan in KCK.

Deepika plays a Bengali girl, who is stylish, fun, sassy, sexy, vivacious and confident. I have given her western outfits like shorts and t-shirts for casual wear and formal shirts and skirts for office wear. I've given her colours like white, beige, red, blue and brown.

Her outfits are smart and sexy, and yet subtle. She is an independent Mumbai girl, whi is upmarket -- she earns well so she can dress up well.

Farhan has two looks in the film.

Director Vijay (Lalwani) was very clear as to how he wanted the two looks to be like. Farhan One has a very understated look. He wears boring outfits. I gave him light colours like greys, browns, creams and beiges.

Farhan Two is stylish and cool. I gave him bright colours like blue and grey. He wears dark, stylish suits.

His character is always overshadowed by Deepika's, so she's the one who is more vibrant and colourful.

I shopped all over Mumbai for their clothes.