Kate Middleton was over the moon when she realised she'd backed a winning horse at Royal Ascot on Friday 17 June.The Duchess of Cambridge, who was attending the annual horse racing event with her husband Prince William, the Duke of Cambridge, couldn't believe her luck when she discovered the news. In sweet pictures of the Royals enjoying their sunny day out, Kate, 40, could be seen laughing and giggling as her jaw dropped in shock.