(left-right) Dolly Maude, Anne, Princess Royal, and Chanelle McCoy during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

(left-right) Dolly Maude, Anne, Princess Royal, and Chanelle McCoy during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

Zara Phillips (second left) Dolly Maude, Anne, Princess Royal, and Chanelle McCoy during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

Zara Phillips (second left) Dolly Maude, Anne, Princess Royal, and Chanelle McCoy during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

CHELTENHAM, ENGLAND - MARCH 15: Camilla, Duchess of Cornwall, Honorary Member of the Jockey Club, speaks to Princess Anne, Princess Royal as they attend the second day of The Festival, Ladies Day, at Cheltenham Racecourse on March 15, 2017 in Cheltenham, England. (Photo by Eddie Mulholland-WPA Pool/Getty Images)

CHELTENHAM, ENGLAND - MARCH 15: Camilla, Duchess of Cornwall,  Honorary Member of the Jockey Club, speaks to Princess Anne, Princess Royal as they attend the second day of The Festival, Ladies Day, at Cheltenham Racecourse on March 15, 2017 in Cheltenham, England. (Photo by Eddie Mulholland-WPA Pool/Getty Images)

Anne, Princess Royal, during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

Anne, Princess Royal, during Ladies Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by Andrew Matthews/PA Images via Getty Images)

CHELTENHAM, ENGLAND - MARCH 15: Zara Tindall (L) speaks with Chanelle McCoy as they attend the second day of The Festival, Ladies Day, at Cheltenham Racecourse on March 15, 2017 in Cheltenham, England. (Photo by Eddie Mulholland-WPA Pool/Getty Images)

CHELTENHAM, ENGLAND - MARCH 15: Zara Tindall (L) speaks with Chanelle McCoy as they attend the second day of The Festival, Ladies Day, at Cheltenham Racecourse on March 15, 2017 in Cheltenham, England. (Photo by Eddie Mulholland-WPA Pool/Getty Images)