Princess of Sylmar is an American-bred Thoroughbred racehorse. In 2013 she appeared to have established herself as the leading American filly of her generation with Grade I wins in the Kentucky Oaks, Coaching Club American Oaks and Alabama Stakes.

The Kentucky Oaks is a Grade I stakes race for three-year-old Thoroughbred fillies staged annually in Louisville, Kentucky, United States. The race currently covers 1+1⁄8 miles (1,800 m) at Churchill Downs; the horses carry 121 pounds (55 kg). The Kentucky Oaks is held on the Friday before the Kentucky Derby each year. The winner gets $846,300 of the $1,500,000 purse, and a large garland blanket of lilies, resulting in the nickname "Lillies for the Fillies." A silver Kentucky Oaks Trophy is presented to the winner.