It is thought that Prince George, Princess Charlotte and Prince Louis will take part in a carriage ride in the finale of The Royal Windsor Horse Show tomorrow

Her Majesty The Queen made an unexpected appearance at The Royal Windsor Horse Show yesterday to watch her pony Balmoral Leia compete.

It is well-known that the annual event is a popular fixture in the Queen's diary as she tries to attend every year.

Following huge applause as she made her way into the stadium, the Queen sat down next to The Earl and Countess of Wessex and The Countess Mountbatten of Burma to watch her granddaughter, Lady Louise Windsor, compete.

The Queen then looked delighted when she was presented with a trophy after one of her Highland ponies won first place in the show.

Her Majesty is expected to attend the show again tomorrow (May 15) for the finale. It has been reported that there will be a very special appearance by ten of the Queen's 12 great-grandchildren as they ride past in carriages.

The Queen has 12 great-grandchildren and they are: Savannah and Isla Phillips, Prince Louis, Princess Charlotte and Princess Charlotte, Mia, Lena and Lucas Tindall, August Brooksbank, Archie and Lilibet Mountbatten-Windsor and Sienna Mapelli Mozzi.

Last month, a member of the public posted footage on social media that they had filmed during a trip to Windsor Castle which showed a number of the Queen's great-grandchildren sitting in carriages - presumably practising for this exciting appearance.

Upon closer inspection, you can clearly see Prince George, Princess Charlotte, Prince Louis, as well as Savannah and Isla Phillips.