An 80-year-old cancer-stricken Los Angeles nun says she’s so broke that she doesn’t know where her next meal will come from — because Katy Perry bought the sister’s convent for some $14 million, setting off a take-no-prisoners legal battle.

Sister Rita Callanan is one of the last nuns still living at the Convent of the Sisters of the Immaculate Heart of Mary — where she thought she’d live until her last days, London’s Daily Mail reported Saturday.

Then the “Firework” singer tried to buy the property from the Roman Catholic Archdiocese of Los Angeles, headed by Jose Gomez. He claims to own the convent and sold it to Perry in 2015, according to the report.

Callanan and her late fellow nun, Sister Catherine Rose Holzman, believed they had the right to sell it.

Click to read the full story from The New York Post.