Zara Tindall, 37, took part in the cross country element the Whatley Manor Horse Trials at Gatcombe Park in Gloucestershire today.
He cute daughter Mia, four, was seen playing with her cousin Isla Phillips, six.
Mia is the daughter of Zara and her husband Mike Tindall, a rugby player.
Zara is a British equestrian who won the Eventing World Championship in Aachen in 2006.
She has also taken part in the Olympics representing Britain in equestrian sports.
Isla Phillips is the daughter of Zara’s brother Peter Phillips, 40, and Autumn Kelly, also 40.
The pair have two daughters, Isla and Savannah, seven.
Zara, on the other hand, has recently has had her second child, Lena Elizabeth Tindall, who is two months old.
Isla wore a cute pink cardigan with a little dog pattern with blue leggings and pink trainers.
Mia wore a blue t-shirt with a green sequin star and jeans.
The two little girls smiled and giggled as they rolled around and played in the grass.
The Gatcombe Horse Trials are taking place for the 23rd time this year.
The riding event takes place on Friday 7th, Saturday 8th and Sunday 9th.
Competitors can take part in dressage, show jumping and cross-country.
HRH The Princess Royal, Princess Anne, 68, presents prizes at the event.
Zara looked smart as she rode in a navy blue jacket.
She wore white jodhpurs with long blue socks and black trainers.
Mike also made an appearance, pushing a pram with little baby Lena in it.
Queen Elizabeth II also made an appearance today, but in Scotland.
She, Prince Charles, 69, Camilla Parker Bowles, 71, and Autumn Phillips, arrived at Crathie Kirk for a service.