These Beauty Cliques Dominated Hollywood in 2015

Who: Sarah Potempa
What: Hairstylist
Social Stats: Instagram user @sarahpotempa, 27.3K followers
Famous Clients: Molly Sims, Ashley Benson, Kristen Stewart, Emily Blunt, Odeya Rush
Fun Fact: Sarah constantly puts her skills to the test with challenges; last year, she tested 100 hairstyles in 100 days. For 2015, she challenged herself to create a new braid for every single day (that's 365 braids!).