Kate Middleton’s wedding dress had a something secretly stitched into it, which many royal fans may never have noticed. Kate Middleton and the future king of England exchanged their vows in front of thousands of guests and 36 million people around the world 13 years ago. Prince William and Princess Kate tied the knot at the picturesque Westminster Abbey on April 29, 2011. The royal wedding is one of the most-watched special days in The Firm, with 29 million tuning in to see Harry and Meghan Markle say ‘I do’ seven years later. Whereas, Princess Diana’s wedding to the then Prince Charles, was b…