Kristin Cavallari's Must Haves, From a $15 Protein Drink to Viral Skin-Care Staples

Out of hundreds of trends swirling across the internet, Cavallari tells us that skin taping is the one that has snuck into her skin-care routine. "I definitely go through phases with them, but I really like them when I'm consistent," she explains. "The only downside for me is that your skin has to be pretty clean for them to stay on all night, and most evenings I'd rather layer on all of my serums and skin care. So it's really just a matter of choosing one or the other." On nights where she feels like reaching for the adhesive, she uses the Skin Gym Face & Mouth Tape Bundle ($40).