Despite her recent skin-baring spreads for magazines like Esquire and even her own Teenage Dream album cover, Katy Perry says she's still modest about some things.

In the upcoming issue of Rolling Stone, the California Gurl takes a bold stance against what she describes as inappropriate use of religious imagery and reveals why her debut single, "I Kissed a Girl," was not a contradiction of her religious upbringing.

"I am sensitive to Russell taking the Lord's name in vain and to Lady Gaga putting a rosary in her mouth," she says in the August 19 issue. "I think when you put sex and spirituality in the same bottle and shake it up, bad things happen."

This isn't the first time that Perry has taken a stab at Lady Gaga. After the premiere in June of Gaga's "Alejandro" video, which features the singer seemingly swallowing a rosary whole, Perry tweeted, "Using blasphemy as entertainment is as cheap as a comedian telling a fart joke."

Perry later backtracked somewhat from the tweet, saying her anger wasn't directed solely at Gaga. "What's funny is that everybody was assuming I was directing it completely towards her, and if I was directing something I would write their '@,' " she told a French radio station. "Lately, I've just been seeing some things that are kind of like, I don't know, in my own personal feelings, a little bit like not something I would do, I guess."

For those who are raising an eyebrow at Perry, a pop star who has participated in her share of provocative photo shoots and videos — her "California Gurls" wardrobe includes a whipped-cream cone bra — she fired back a few words in response, telling Rolling Stone, "Yes, I said I kissed a girl. But I didn't say I kissed a girl while f---ing a crucifix."

What do you think about Katy's stance on sex and spirituality in pop music? Sound off in the comments!