Below, an investigation.
Murmurs of a supposed falling out between Kate and her former best friend Rose Hanbury, who is married to British aristocrat David Rocksavage the 7th Marquess of Cholmondeley, were first reported by UK outlet The Sun last month.
According to the publication, the Duchess of Cambridge and Rose's friendship has recently soured with Kate seeing her as a "rural rival" and wanting her "phased out" of their close-knit country clan. Sources allegedly claimed the friend's rift was so bad, Prince William tried to step in to "try to broke peace".
Royal commentator Richard Kay revealed in his column for the Daily Mail that both parties were considering legal action over the claims.
Twitter began to explode with rumours that the friends' rift began following an affair between William and Rose. The Times food writer Giles Coren responded, "Yes. it is an affair. i haven't read thee piece but i know about the affair. everyone knows about the affair, darling. even us jews. (although admittedly i'm quite a posh jew – if such a thing exists."
His Tweet was quickly deleted.
"These hurtful rumours of a fall-out are simply false. William and David were in touch with each other over the weekend, not knowing whether to laugh or complain. Both wives are hurt by the suggestion that there is any argument or even a coolness between them. They have plans for future events involving their charity."
WATCH: Kate Middleton Just Channelled Princess Charlotte.
This article originally appeared on InStyle Australia.