Celebrity colorist Bianca Hillier, a.k.a., the queen of balayage, told ET why she's looking to the Olsen Twins for hair inspo ...

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 ...

Elizabeth Olsen Hits Emmys Red Carpet in Gown Designed by Sisters Mary-Kate and Ashley: 'Sister Love' Earlier this year, Mary-Kate, 35, opened up in a rare interview about why she and her sister ...

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 ...