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Singer Katy Perry is upset with Madonna for peppering her music, videos and performances with religious references and says she doesn't like it when artists take spirituality "lightly".

Perry, daughter of pastors, despite her racy performances, is a dedicated Christian. She gets upsets when pop acts use faith as a gimmick for their gigs.

She blasted Madonna who has had a notoriously strained relationship with the Catholic Church - for daring to perform on a cross during her 2006 Confessions tour.

"For me, spirituality is something very important and I don't like it when people take it lightly," contactmusic.com quoted Perry as saying. "At times, I don't understand why there are artists who play that card, like when Madonna gets up on a cross to sing."