A new royal tell-all book is hitting shelves this month, and in an excerpt from Tom Quinn's Yes Ma'am: The Secret Life of Royal Servants, published in the Times Feb. 6, the royal author reveals a story about Prince William that will tug at anyone's heartstrings.

The Princess of Wales has become known for her impeccable sense of style over the years - but it hasn't stopped her husband making jokes about her outfits

"Before Kate realised that as a senior royal you have to dress carefully, having taken advice, she once bought an outfit that William considered inappropriate," the advisor said. "He told Kate she looked as if she’d just run through a charity shop covered in superglue. Everyone thought this was very funny, including, to her credit, Kate."