In the beginning of April, the Marvelous Mrs. Maisel actress brightened her signature glossy black lob with dirty-blonde highlights in one of the dreamiest celeb hair-colou Like the star's initial color change, it looks as though the second-round refresh came at the hands of Bumble & Bumble colorist Kitty Greller, who recently posted an Instagram shot of Brosnahan in the chair with telltale aluminum foil coating her hair. "Blonder and blonder we go," Greller captioned the shot. r transformations we've seen all year. But, like so many bottle blondes before her, the transformation didn't stop there: Brosnahan just went even lighter, to a shade that borders on platinum