The 'Hard Out Here' hitmaker, who is about to release her new record 'Sheezus', appears to hit out at the stars by joking about celebrities who attend corporate events.
According to the Daily Mirror newspaper, she said: ''I still need to write letters to Rita Ora and Cara Delevingne.
''The song where I appear to slag off Rita and Jourdan is very much the same premise as Cheryl Tweedy. It's not about them, it's about the idea of them.''
Meanwhile, the 28-year-old star, who has made her comeback after a four-year hiatus, was copied into harsh emails about her new material from a focus group when her record label carried out market research for her new album.
She told Pop Justice: ''I accidentally got copied in on a whole bunch of it and reading it was one of the most horrible moments of my life.
''They don't actually tell the people what it is that they're listening to. So a lot of it was just people going, 'Is this Lily Allen? It f****ng is Lily Allen', 'If this is her I thought she'd fucking retired, the stupid ****!'''
She insists she found the bad feedback, which she received six months ago, ''totally unhelpful'' for her career.
Lily added: ''The thing is, people who take part in market research: are they really representative of the marketplace? Probably not.''
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.