need to focus on your diet really.
as long as your protein intake is enough then you should be doin a lot of cardio (5 times per week, 45-60mins steady pace minimum) and lifting weights to maintain the muscle, the fat will come off, aim to lose 2lbs of fat per week, no more.
heres a few articles i found recently that give an insight into some fitness models diets and regimes:
Bodybuilding.com - Josh Englehart - Male Transformation Of The Week - Josh Englehart.
Neil Rigney Male Model - How to get a Model physique
Meet Our Fitness Models Team - Anthony Catanzaro Diet & Exercise Advice