You don't need to shampoo your locks daily to have a great-looking hairstyle. Just ask Christa B. Allen, 21, star of ABC's hit Revenge, who washes her hair every two to three days. The secret? "Dry shampoo is brilliant!" the actress tells Us Weekly in an exclusive how-to video.

PHOTOS: Spring's hottest celeb haircuts

Dry shampoo can extend a Monday blowout to Friday. To get the cute side ponytail modeled by Allen below, "start with dry shampoo to soak up oil," says L.A. hair pro Luke Chamberlain.

Watch the video as Chamberlain handily turns her long unwashed locks into a Spring-ready braided side ponytail.

To see him style Allen's hair into a pin-up side sweep, click here; and to see him create milkmaid braids, click here. All of these 'dos are done best on hair that hasn't been shampooed in a day (or three!).

This article originally appeared on How to Style Unwashed Hair -- Christa B. Allen Shows You How!