The Queen’s great-granddaughters were snapped as they enjoyed a day out in the glorious summer sunshine.
And to keep cool Mia, Zara and Mike Tindall’s eldest daughter, enjoyed an ice lolly while Isla tucked into an ice cream.
A barefoot Mia looked full of beans as she had a go on the slide as her older cousin excitedly watched on.
The pair were snapped at The Magic Millions Festival of British Eventing in Gatcombe, Gloucestershire, as they enjoy their summer holidays.
MIA TINDALL IN PICTURES
Mia, 4, looked adorable in a blue and white star-patterned dress, teamed with tanned sandals.
While sixIsla, daughter of Peter and Autumn Phillips, looked equally cute in a navy flowered jumpsuit.
But there was no sign of Mia’s newborn sister, Lena.
The cheeky royal recently became a big sister after Zara and Mike welcomed their baby daughter into the world on June 18.
Mr Tindall, former rugby star, recently opened up on his new life as a father-of-two and how his girls are getting along.
Speaking about how his eldest daughter took the arrival of the two-week old sister, he told Hello Magazine: “She is very happy to a big sister, she is happy about that”.
He also explained Zara and him, who have been married since 2011, didn’t spoilt Mia with gifts amid the arrival of Lena, a trick often used by parents to help new siblings adjust.
Zara was spotted out for the first time since giving birth as she and Mia attended the Celtic Manor Resort’s Celebrity Cup gold tournament to cheer on husband Mike.