I'm not difficult: Naomi Campbell

Supermodel Naomi Campbell wonders why people feel she is a tough person to work with. She says she is only a professional

"If I was so difficult, why would I be working with the same people I have worked with since I was 16," dailystar.co.uk quoted Campbell as saying.

"You call it difficult, but I call it professional," she added.Campbell, 43, has walked the ramp for many designers in her career spanning over two decades and she has also judged reality show "The Face".