Well, apparently, it took the stylish songbird a lot of work to become cover-worthy.
Perry, who stopped by the Tonight Show With Jay Leno on Friday, told the talk show host all about her extreme diet regimen prior to posing for her first cover for the iconic fashion magazine—and we're exhausted (and starved) just hearing about it!
"I did a lot of my own prepping," she shared. "I kind of went on a cleanse…I did a lot of stuff like vitamins and supplements, I changed my coffee to green tea, I didn't drink any alcohol for three months. So I was really in the zone; I just wanted to be glowing for that cover."