I use my fingers and a stippling brush (MAC 188). I pump out a small amount (you need to be VERY gentle or you'll get waaaaay to much) and swipe it from the spout with my finger. I then dab it on my cheeks a bit, and finish blending it out with the 188. I liked using only my fingers initially, but I found that it was too easy to completely blend the color away, so the 188 helps with that
I pump out a tiny bit onto the back of my hand or palette and apply it using a slightly damp duo fiber brush (I usually spritz very lightly with Fix+) using a stippling motion at first, and then blend it in. I've found that I get a very pretty, natural effect that way.