Since breaking onto the scene, Katy Perry has shown more skin and dropped more F-bombs than just about any other pop starlet out there. But having been raised by a couple of evangelical ministers -- who speak in tongues, she says -- there's just no shaking the 'I Kissed a Girl' singer's spirituality, even if her life is filled with not-exactly-Christian elements (living with a sex addict included).

In a chat with Rolling Stone, Perry explains that "bad things happen" when performers blend sex and spirituality and pointedly zeroes in on one of her main pop competitors.

"I am sensitive to Russell [Brand, her fiance] taking the Lord's name in vain and to Lady Gaga putting a rosary in her mouth," she tells Rolling Stone. "I think when you put sex and spirituality in the same bottle and shake it up, bad things happen."

In June, Perry launched an attack on Gaga for her 'Alejandro' video, in which the singer dresses as a nun and gobbles up a rosary. In a Twitter post, Perry said using "blasphemy as entertainment is as cheap as a comedian telling a fart joke."