Rachel Alexandra is a famous American thoroughbred racehorse known for her impressive performances on the racetrack. Born on January 29, 2006, she quickly gained attention for her speed and agility, winning several prestigious races, including the Kentucky Oaks in 2009. In 2009, Rachel Alexandra made history by becoming the first filly to win the Preakness Stakes since 1924, defeating male competitors. Her remarkable achievements earned her the title of Horse of the Year in 2009, making her one of the most celebrated racehorses in the sport's history.