CHELTENHAM, ENGLAND - MARCH 17: Princess Anne, The Princess Royal and Tim Lawrence attend Gold Cup Day on day four of the Cheltenham Festival at Cheltenham Racecourse on March 17, 2017 in Cheltenham, England. (Photo by Ian Walton/Getty Images)

CHELTENHAM, ENGLAND - MARCH 17:  Princess Anne, The Princess Royal and Tim Lawrence attend Gold Cup Day on day four of the Cheltenham Festival at Cheltenham Racecourse on March 17, 2017 in Cheltenham, England.  (Photo by Ian Walton/Getty Images)

Princess Anne (left) presents Jockey Robbie Power with the Timico Gold Cup after his winning ride on Sizing John in the Timico Cheltenham Gold Cup Chase during Gold Cup Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by David Davies/PA Images via Getty Images)

Princess Anne (left) presents Jockey Robbie Power with the Timico Gold Cup after his winning ride on Sizing John in the Timico Cheltenham Gold Cup Chase during Gold Cup Day of the 2017 Cheltenham Festival at Cheltenham Racecourse. (Photo by David Davies/PA Images via Getty Images)