Katie Nicholls, the author of the 2010 biography William and Harry, claims that the Queen found Middleton's in-your-face lavish lifestyle "unpalatable".
Nicholls writes: “If [Kate] was not with William at Balmoral then the couple were skiing or holidaying on Mustique.
“Kate was there so often the press dubbed her ‘Queen of Mustique’, a title that had previously belonged to Princess Margaret.”
According to The Sun, a source told the royal expert that: “Swanning from one five-star holiday resort to another is not the prerequisite for a young woman possibly destined to be Queen.”
Nicholls explains that back in 2008 Britain was in a recession and as such, the Queen didn't think it was appropriate that the future Duchess of Cambridge would flaunt her wealth on the London club scene or by going on fancy holidays.
The author wrote: “Britain was now in recession and such frivolous displays of wealth were unpalatable to The Queen.”
Prince William and Kate Middleton met in 2001 at St Andrew's, and are thought to have started dating in 2003.
The couple are now parents to Prince George, five, Princess Charlotte, three, and Princes Louis, 10-months-old.
These are the VERY strange rules Prince George and Princess Charlotte have to follow: