ABC gives viewers the royal treatment tonight when it marks the 60-year reign of Britain's Queen Elizabeth II with a two-hour installment of 20/20. Helmed by Katie Couric, the special includes interviews with Queen Elizabeth's grandsons, Prince William and Prince Harry, her son, The Duke of York, Prince Andrew, and his daughters Princesses Beatrice and Eugenie. Viewers will also take a tour of Buckingham Palace, and learn about the royal family's day-to-day life.