Many people call her Kate Middleton, but it should come as no surprise to royal fans that she actually prefers to be called something else.
According to royal biographer Robert Jobson’s latest book, Catherine, the Princess of Wales, Middleton sent a playful email to her friends back in 2008, asking them to call her by her birth name, Catherine, instead of the more informal “Kate,” People reports.
The outlet adds that Jobson’s book drew from a 2008 article by Sunday Express columnist Adam Helliker, who revealed Kate’s “humorous email to her close friends.” This request, Jobson noted, only fueled rumors that Prince William was about to propose.