Does your stomach puff out somewhat, despite strict dieting and exercise? Check your standing posture. Stand straight. See if you can keep a book balanced on your head while walking. How do you sit at work? At home at the computer? While watching TV? Don't slump in your chair. Slouching or slumping will accentuate tummy fat. Sit straight and you'll look trimmer.
Good sitting and standing posture will strengthen lower back muscles, and stronger lower back muscles will make you more efficient at performing ab-targeting exercises as well as fat-blasters like deadlifts and barbell squats.