The 29-year-old just underwent her third major transformation of the year - returning to her signature honey "bronde" shade. Hairstylist Kristen Ess is responsible for lightening Lucy's tresses, the actress recently dabbled in the dark side with a deep brown.
The celebrity hair-guru shared the first photo of Lucy's new look, explaining that she subtly lifted the darker hair dyer to avoid causing damage.
"Chameleon AF. The life of an actor can be really hard on the hair. Thank goodness she’s got the face of an angel and the patience of a saint.
"When going from dark brown to blonde, trust your colourist to do it at the right pace to keep your hair from snapping off."
See her makeover below.