While out promoting her new movie "Sicario," actress Emily Blunt was asked about her stint in the 2006 fashion comedy drama "The Devil Wears Prada, wherein she played "Runway" assistant Emily, who got to boss newbie Andy Sachs (Anne Hathaway) around.

The movie was quite a treat for fans who saw it, what with they characters' catty conversations, ostentatious behavior, and fashionable clothing. And during an interview with Entertainment Weekly and PEOPLE editorial director Jess Cagle on Sirius XM's EW Radio, Blunt revealed that the whole cast had a grand time during production, saying that they enjoyed making the film just as much as fans enjoyed watching it.

"I had so much fun with that part it was just mind-blowing," she said.

The one thing that Blunt found difficult, however, was being mean to Hathaway's character Andy (even though it's just acting). Emily was somewhat mean towards Andy, and looked down on her because she knew nothing about fashion. But apparently, shooting those few catty scenes had been an uphill climb.

"With those lovely doe eyes of hers? Very hard!" Blunt said.

Blunt also had high praises for Meryll Streep, who portrayed Emily's boss Miranda Priestley, and said that it was "fascinating" watching the Oscar winner get to work.

"I remember that first table read and she just submarined (everything) - she didn't even raise her voice, it was so frightening," the actress recalled. "It was just so fascinating, and I think it's actually one of my favorite things she's ever done."

For her new movie "Sicario," Blunt shifted from the world of high fashion to drugs. She plays FBI agent Kate Macer, who is determined to bust the drug trade in the US-Mexico border.

According to Blunt, it was very interesting taking on the role of Kate, since she has a "really superior moral compass."

"To see those ideals systematically broken down throughout the course of three days, which is a limited period for your whole life to be shifted," Blunt said. "And I think it's unusual, it's somewhat of an anomaly, to have the female protagonist be this sort of action-esque character, and for female cops to be represented in a realistic way on film."

She actually spoke to several female FBI agents prior to taking on the role just so she would have a more compelling delivery of the character.

"Speaking to these women was really insightful because they were very honest with me," she said, "from what affects their sleep, how the job affects their family, their relationships, their children, their friendships. That was the more internal sort of insight I had into the character."