Guests were apparently sworn to silence. William's close friend and likely attendee Thomas van Straubenzee told the Telegraph, "I'm very sorry, but I have got to keep it a secret. I hope you understand."
What about Kate Middleton's bachelorette party? Speculation is it will be a "Dirty Dancing"-themed party organized by Kate's sister, Pippa, to be held at the family home in the wealthy English village of Bucklebury.