Katy Perry recently visited an 8-acre Los Feliz estate in Los Angeles she's hoping to purchase in the future, where she sang to a group of nuns.

The 30-year-old singer has been in an ongoing legal battle with the nuns over the property, according to Billboard.

Originally, the California Institute of the Sisters of the Most Holy and Immaculate Heart of the Blessed Virgin Mary bought the estate in the 1970s. Now the Los Angeles Archbishop Jose H. Gomez wants to sell the property to Perry, but it's uncertain whether he has the authority to make that decision.

Sister Catherine Rose Holzman, who took her vows 68 years ago at the age of 18 and previously lived in the convent, is against selling the property to Perry.

"Katy Perry represents everything we don't believe in," Holzman said. "It would be a sin to sell to her."

Perry visited the convent on May 26 and showed the nuns her left-wrist tattoo that says "Jesus," which she had done when she was 18. At the request of Sister Jean-Marie Dunne, Perry sang the gospel song "Oh Happy Day" to the nuns while reading the lyrics off her iPhone.

"She was nice," Holzman added. "She told us why she wanted the property and then sang a song and left."

The Archdiocese of Los Angeles forced the nuns to leave the convent four years ago.

"We had to do what we were told," Holzman said. "I think it's because they were trying to sell our property. They had been trying for years even when we lived there. But none of us ever wanted to leave."

Perry is the daughter of evangelical Christian ministers, and first began her career as a Christian singer under her actual name Katy Hudson.