The "Fireworks" singer gushed to the fashion mag about her longtime friendship with the fellow pop star, but didn't sugar coat her concerns for RiRi.
"I love her and every time I see her, I'm reminded of the light that she has," Katy explained. "There's a lot of dark in this business."
And while Katy didn't have a bad word to say about the "Diamonds" singer, she did hint that she's not super keen on the people RiRi chooses to surround herself with.
"I know a lot of people out there with the most detrimental entourages—they are the root of their demise," she said without naming anyone in particular. "It's really unfortunate but you can't save these people. My days of celebrity saving are over."
It's no secret that the Barbadian beauty and her entourage are known to get a little rowdy, especially on their favorite social media sites, but Katy kept cool and didn't point any fingers.
She did, however, address the romance rumors with Robert Pattinson head-on.
In fact, that 28-year-old explained that there are two simple reasons behind all those pesky reports: her boobs.
"I sent her a text message saying, ‘I know you've seen all this stuff, but you know I would never disrespect you. I'm not that person,'" Katy recalls. "'I'm just trying to be a friend to him but it is unfortunate that I do have a set of tits."'
"I realized I could lose the person I loved and I had to deal with some things, issues I think a lot of women have," she continued.
Between RiRi, boobs and R.Pattz, Katy made sure to tell it like it is!