Emily Blunt

Emily Blunt and her new strawberry blonde hair color. Photo: Dave M. Benett/Getty Images

We've always loved how Emily Blunt looks with her sexy, dark chocolate hair. But we recently spotted the 27-year-old British beauty with much lighter locks at the premiere of her new film, "Gnomeo & Juliet" in Hollywood, California.

So why is Blunt messing with a good thing? Apparently for a new role.

The "Devil Wears Prada" star has been gradually lightening her tresses in preparation for the upcoming time-travel thriller, "Looper" where she plays a mother protecting her son. Blunt has reportedly been having weekly sessions with colorist Anival Morales at the Essensuals London Salon in Los Angeles to take her from a sultry brunette to a strawberry blonde.

In fact, her locks are more like the bronde hue that was all the rage last year. Remember Miley Cyrus and J.Lo with their sun-kissed locks?

We understand when duty calls, but hopefully when Blunt is finished filming her new role, she will revert to her darker days as a brunette.

What do you think? Leave a comment below.

Meanwhile, if you're a brunette, check out these makeup tips just for you!

Click through the photo gallery below to see how thick hair goes from basic to beachy with the help of star stylist and Hair Basics expert, Ted Gibson.