Katy Perry has said that her days of "saving" celebrities are over.
When asked about her friendship with Rihanna, the singer told Elle that some stars have "detrimental entourages" who cause all their problems
I love her [Rihanna] and every time I see her, I'm reminded of the light that she has," Perry said.
"There's a lot of dark in this business. I know a lot of people out there with the most detrimental entourages - they are the root of their demise.
"It's really unfortunate but you can't save these people. My days of celebrity saving are over."
Perry also revealed that she had been in touch with Kristen Stewart about rumors linking her to her ex-boyfriend and Twilight co-star Robert Pattinson.
Perry said: "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. I'm just trying to be a friend to him but it is unfortunate that I do have a set of ****'."
Of her own relationships with "challenging" men, she added: men I have gone for are challenging, yes, but they're also wildly intelligent and poetic.
"I'm not interested in taming anyone - I'm pretty wild myself."
Asked about her split from John Mayer in February, Perry said: "He pulled away. That was a big hello for me. 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.
"You can be strong in one aspect of your life but submissive in another. In relationships, it was hard for me to speak up and set boundaries. I think a lot of that was to do with the fear of loss."
The full Katy Perry interview appears in the September issue of Elle UK, on sale Wednesday, (July 31). Also available as a digital edition.
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