Perry featured on the cover of the fashion magazine for the first time, so she put in a lot of effort to glow.

Katy Perry
Katy Perry. Pic/Santa Banta

“I did a lot of my own prepping. 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 alcohol for three months," quoted the 28-year-old as saying.

"I was really in the zone, I just wanted to be glowing for that cover,” she added. The singer has been on the cover of magazines like Seventeen, Glamour, Cosmopolitan, Elle and Vanity Fair.