
Kate Middleton's romance with Prince William began after the pair met at the University of St Andrews in 2001. After a brief split in 2007, the pair reunited and have been together ever since. When William and Kate first started dating, the Prince of Wales's friends reportedly came up with a slightly "strange" nickname for the royal's new girlfriend.
In the book The Making of a Royal Romance: William, Kate, and Harry—A Look Behind the Palace Walls, royal expert Katie Nicholl revealed (via the Daily Mail), "William's friends jokingly refer to the close-knit family as 'the OM Middleton' meaning the 'On Masse Middletons' because they are always together."