As with powder eye shadow, never put your fingers in your powder blush to prevent it from caking. A blush brush is the way to go for perfect rosy cheeks. It's designed to define the natural curves of the cheek area.
Starting at the center of your cheekbone, sometimes called the "apple" of the cheek, gradually move your blush brush in a round circle. And voilà! Your blush will look natural, and you'll look warm, youthful and happy.