The R.I.P. hitmaker and the catwalk beauty are among a number of stars name-checked by Allen in a track called Insincerely Yours, which criticises the U.K.'s celebrity party scene.
Allen fears the stars she has mentioned in her music may be offended, so she is planing to explain herself in a note.
She tells Popjustice.com, "A few people have said to me, 'You're going to p**s off so many people by name-checking this person and that person' and I think, 'Well, yes', but I've always made a thing of social commentary and commentary on pop culture, and I don't think you can do that unless you name-check the people at the forefront of that culture.
"Actually I still need to write letters to Rita Ora and Cara Delevingne. In actual fact the song where I appear to slag off Rita and (model) Jordan... It's not about them, it's about the idea of them - how the media perceive them. It's about how the way (sic) the media perceive them as entities and how that actually has nothing to do with how they are in real life. And Delevingne rhymes with magazine."