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The Earl of Wessex (left), The Countess of Wessex (centre) and Savannah Phillips (right) waving at Lady Louise Windsor at the Champagne Laurent-Perrier Meet of the British Driving Society at the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Berkshire. (Photo by Steve Parsons/PA Images via Getty Images)

The Earl of Wessex (left), The Countess of Wessex (centre) and Savannah Phillips (right) waving at Lady Louise Windsor at the Champagne Laurent-Perrier Meet of the British Driving Society at the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Berkshire. (Photo by Steve Parsons/PA Images via Getty Images)

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WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and son James, Viscount Severn attend day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and son James, Viscount Severn attend day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

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WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Autumn Phillips takes photographs (using an iPhone) of her daughters Savannah and Isla Phillips playing on a climbing on day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Autumn Phillips takes photographs (using an iPhone) of her daughters Savannah and Isla Phillips playing on a climbing on day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

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WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Autumn Phillips hugs Sophie, Countess of Wessex as they attend day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

WINDSOR, UNITED KINGDOM - MAY 13: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Autumn Phillips hugs Sophie, Countess of Wessex as they attend day 4 of the Royal Windsor Horse Show in Home Park on May 13, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

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Autumn Phillips (left) after having her fortune told during the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Berkshire. (Photo by Steve Parsons/PA Images via Getty Images)

Autumn Phillips (left) after having her fortune told during the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Berkshire. (Photo by Steve Parsons/PA Images via Getty Images)