Pop star Katy Perry gave up alcohol for three months and increased the intake of vitamins to make her face glow.
Perry featured on the cover of the fashion magazine for the first time, so she put in a lot of effort to glow.
"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," femalefirst.co.uk 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.