STROUD, UNITED KINGDOM - AUGUST 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall eats an ice cream as she attends day 3 of the Festival of British Eventing at Gatcombe Park on August 7, 2016 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
STROUD, UNITED KINGDOM - AUGUST 06: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall plays on a bouncy castle slide as she attends day 2 of the Festival of British Eventing at Gatcombe Park on August 6, 2016 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
TETBURY, UNITED KINGDOM - JUNE 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall watches her mother Zara Phillips play in a Jockeys vs Olympians charity polo match at the Beaufort Polo Club on June 19, 2016 in Tetbury, England. (Photo by Max Mumby/Indigo/Getty Images)
STROUD, UNITED KINGDOM - AUGUST 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall, daughter of Zara Phillips & Mike Tindall, plays with some car keys as she attends day 1 of the Festival of British Eventing at Gatcombe Park on August 7, 2015 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
STROUD, UNITED KINGDOM - AUGUST 09: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall attends day 3 of the Festival of British Eventing at Gatcombe Park on August 9, 2015 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)
