If you're a longtime reader of Bella, then you'll know that I'm a big fan of multitaskers. And one of the greatest things about a multitasking makeup duo is that you can easily customize your own shade by blending the two colors together. In turn, some of these coupled cosmetics come with a preapplication product (like a primer), along with the makeup item itself. Even better, they take up little space. Check out the widget below for inspiration, and tell us: what's your favorite doubled-up product?