Britain's Queen Elizabeth II strokes one of her horses during the Royal Windsor Horse Show in Windsor, Berkshire, on May 13, 2011. The horse show is the largest outdoor equestrian Show in the UK, with over 3,000 horses and ponies taking part in more than 250 jumping, showing, and carriage driving classes. It runs in conjunction with the Royal Windsor Tattoo, a military show which takes place in the grounds of Windsor Castle. Getty Images