Legendary actress Meryl Streep had a hard time filming one of her most well-known movies.

In 2006, the Oscar-winner starred in “The Devil Wears Prada” as Miranda Priestly, the mean-spirited editor-in-chief of a high fashion magazine who treated employees poorly as a way to cope with her crumbling personal life.

In celebration of the movie’s 15th anniversary, Streep and her co-stars spoke to Entertainment Weekly about their time working on the film.

Streep, now 71, famously employed a method acting style while filming, often retaining elements of her icy character while not in front of the camera, even brushing off famous co-stars Emily Blunt and Anne Hathaway.

“Meryl is so gregarious and fun as hell, in some ways it wasn’t the most fun for her having to remove herself,” Blunt told the publication. “It wasn’t like she was unapproachable; You could go up to her and say, ‘Oh my God, the funniest thing just happened,’ and she’d listen, but I don’t know if it was the most fun for her to be on set being that way.”

“It was horrible!” Streep admitted. “I was [miserable] in my trailer. I could hear them all rocking and laughing. I was so depressed! I said, ‘Well, it’s the price you pay for being boss!'”