Allison was also blonde back in 2017 which is what the star is probably referring to, obviously, due to the damage it would be doing to her hair dying it lighter again.
Getty
This time, however, the hair-change is for a new movie role showing her dedication as an actress, despite putting her feelings out there that she would prefer not to.
Getty/Allison Williams Instagram
We suggest lots of hair treatments after this new role is done and dusted Allison!
