Now, apply your regular concealer (the one you typically use to cover redness or blemishes on other parts of your face) over the area. Katie's current favorites are Urban Decay Weightless Concealer, $28 and NARS Creamy Concealer, $29.

Using your brush again, blend your second concealer well. Blend it downwards (covering more than just the dark circles) to add brightness wherever your face needs it.

Again, use your fingers to blend over all of the concealer that you applied to remove any excess that your skin simply doesn't need. If you're worried about the concealer settling into any wrinkles, Katie says this is the crucial step to remember to make sure that excess makeup doesn't hang around.

Set your concealers with a light dusting of powder -- a very soft brush will give you the best result.

If you're always on the go, opt for a pressed powder like NARS Perfecting Powder in Translucent, $37.

If you have a darker complexion, choose a powder with a peach tone so it won't have an ashy effect on the skin once applied.

And if you're worried about wrinkles being visible when the makeup sets, use a superfine powder like Laura Mercier Secret Brightening Powder, $25.