Zara and Mike Tindall's daughter Mia (right) with her cousin Savannah Phillips (left) at the Land Rover Gatcombe Horse trials in Gloucestershire. (Photo by Steve Parsons/PA Images via Getty Images)
STROUD, UNITED KINGDOM - MARCH 25: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Isla Phillips, Mia Tindall and Savannah Phillips play with a dog as they attend the Gatcombe Horse Trials at Gatcombe Park on March 25, 2017 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
STROUD, UNITED KINGDOM - MARCH 25: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Savannah Phillips and cousin Mia Tindall attend the Gatcombe Horse Trials at Gatcombe Park on March 25, 2017 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
STROUD, ENGLAND - MARCH 25: Mia Tindall plays with her cousins Savannah Phillips and Isla Phillips during the Gatcombe Horse Trials at Gatcombe Park on March 25, 2017 in Stroud, England. (Photo by Anwar Hussein/WireImage)
STROUD, UNITED KINGDOM - MARCH 25: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall and cousin Savannah Phillips attend the Gatcombe Horse Trials at Gatcombe Park on March 25, 2017 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
