The 28-year-old British beauty will model for the timeless, classic fragrance in television, print and outdoor ads shot by Romain Gavras and Patrick Demarchelier, respectively.
"I am very honored to have been chosen to be the face of Opium," Blunt said in a statement. "It is really exciting to embody a fragrance which has stood the test of time without its allure ever being diminished." (YSL introduced the perfume in 1977.)
"OPIUM is more than a fragrance; it's a myth that embraces the whole history and values of our House," added Renaud de Lesquen, President of YSL & Designer Brands. "Over and above her beauty and elegance, we were impressed by the career and artistic options of Emily Blunt."
This is the first beauty spokesmodel gig for The Adjustment Bureau actress, who's married to The Office's John Krasinski. She follows in the footsteps of model Sophie Dahl, who was photographed for the seductive scent in 2000.