Emily Blunt
Courtesy of SPE Inc./Eric Charbonneau

After Joseph Gordon-Levitt‘s appearance on Saturday Night Live this weekend, it seems everyone is buzzing about how he plays a younger version of Bruce Willis in the new time-travel film Looperwhich opens in theaters today. Not to be missed is Emily Blunt, who co-stars with the two boys and revived her blonde locks specifically to play the role of Sara. We’ve loved Emily since her breakout role in 2006′s The Devil Wears Prada—whether blonde, brunette, or red-headed, she always looks amazing! See how she’s transformed in the gallery.

EMILY'S TRANSFORMATION

MORE:
Reader Beauty FAQs: Hair Color
Try on Emily Blunt’s Hair!
Emily’s Best Looks Ever