Kate treats gorgeous George to day out at Beaufort Polo Club

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276az) Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

After stealing the show from his great-grandmother, the Queen, at her official birthday yesterday, adorable Prince George was out again on Sunday enjoying a day at the polo with the Duchess of Cambridge and Prince William.

The 23-month-old prince was pictured playing on the lawn, picking the grass and sliding down a hill with mum Kate at the Festival of Polo at the Beaufort Polo Club in Gloucestershire.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276au) Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

Autumn Phillips couldn't resist joining in the fun and played with George as he made his way down a slope.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276bg) Autumn Phillips and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

Duchess Kate was pictured wearing casual jeans, a striped blue top and flat Sebago boat shoes at the event, while George was dressed in an all-blue ensemble of a cute cardigan, shorts and Crocs.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276bd) Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

Kate looked relaxed as she ran after the toddler. The pair watched as Prince William took part in the polo.

There was no sign of six-week-old Charlotte and Kate and George walked over to Prince William who held his son as the couple chatted.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276bq) Prince William, Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

Zara Phillips, Mike Tindall and their daughter Mia Grace, along with Peter Phillips, his wife Autumn and their children Isla and Savannah joined Kate, William and George at the event.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276ch) Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

At the Trooping the Colour on Saturday, George was pictured cheekily looking out of the window from the palace window as Kate attended the ceremony below.

Mandatory Credit: Photo by Tim Rooke/REX Shutterstock (4848276bo) Catherine Duchess of Cambridge and Prince George British Royals at Beaufort Polo Club, Gloucestershire, Britain - 14 Jun 2015

All eyes were on the toddler as the royal family appeared on the balcony. Kensington Palace later confirmed that he wore the same outfit his father wore on the balcony at the Queen's birthday parade in 1984.