Related: The Unofficial Guide to Mary-Kate and Ashley Olsen's Hair Evolution Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to ...

I 'Don't Compete' with Their 'Partnership' Mary-Kate and Ashley Olsen's Hairstylist Reveals Secret to the Sisters' Signature Waves and How Their Hair Differs Mary-Kate and Ashley Olsen's The Row ...

Mark-Kate and Ashley Olsen are, fashionably speaking, known for two things: good style and good hair. For decades ... Never miss a story — sign up for PEOPLE's free daily newsletter to stay ...