"Sienna's hair color is a soft sun-kissed golden blond with warm butterscotch highlights around the crown," says celebrity colorist and Redken Creative Consultant for Color, Tracey Cunningham
, who has colored Miller's hair in the past. "Her hair color is very blond, but not overpowering or too brightit is just the perfect shade of blond."WHO CAN WEAR IT
"Usually blond looks best on someone with fair skin tones and light eyes," she says. "It really makes their eye color pop and complements their skin tone." HOW TO GET IT
"Ask your colorist for a soft golden blond with a few butterscotch highlights throughout the crown," says Cunningham.