Whether you're in need of a beauty refresh for spring or a self-proclaimed beauty girl, Ulta's 21 Days of Beauty Sale is in full swing - and yes, it's packed with incredible deals. You can score up to 50 percent off viral beauty products until March 27, with extra high deal days being March 14 and March 21. These steals change daily and weekly, so it's best to monitor the site to find what best s…