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No stranger to a dye job, the hair chameleon wore her freshly honey-highlighted and loose-waved hair pinned back in a chic updo, and finished off her red carpet look with a strapless Calvin Klein dress.
The hair change-up is a drastic switch from her usual style, as the brunette beauty has been wearing her hair naturally dark for the past few months. It's unclear if the color swap was for business or pleasure, but the former is the most likely, as Blunt is currently closing down London landmarks filming All You Need Is Kill alongside Tom Cruise.
in any case, it's not Emily's first time as a blonde, as she previously lightened up early last year while filming Looper.