The 27-year-old singer spends huge amount on buying her linen and getting it specially-cleaned, reported Contactmusic.
"She only sleeps on high thread count Pratesi sheets with pink detailing. She even has them dry cleaned - not washed," a source said.
"She is a little germophobic and can also be picky about who handles her sheets - she sends one of her own assistants to handle the dry cleaning wherever possible," the source added.