This weekend marks a very special public celebration of Her Majesty the Queen Elizabeth's ninetieth birthday.
The events and shows at Windsor include more than 1,500 performers from across the globe, hundreds of horses and more than 25,000 spectators.
ITV Meridian's Sangeeta Bhabra and Simon Parkin presented the live programme from the grounds of Windsor Castle, speaking to many of the people taking part both in front of, and behind the scenes. Join us in a celebration of the 90th birthday of Her Majesty the Queen.
The Queen and her husband, the Duke of Edinburgh, will attend the final night of celebrations on Sunday. There will be live coverage of the star-studded event in a programme hosted by Ant & Dec, on ITV from 8.35pm on the evening of Sunday 15th May..
The Queen's love of horses is well documented and that passion is reflected in the celebrations over the next few nights.
As a young princess she enjoyed riding in Windsor Great Park - something she still does today.
The Queen owns and breeds thoroughbreds. Those close to her say horse racing is when she really relaxes. Penny Silvester has been talking to the Queen's Racing Advisor, John Warren, about why her affection for these animals runs so deep.
On Sunday, The King's Troop will perform in front of the Queen and it's taken months of training to get them ready.
The soldiers on horseback were first formed in 1946 to be a show piece during ceremonies of state. Simon Parkin went to see them rehearsing.
The Queen's 90th birthday celebrations in Windsor this weekend are set to be an event to remember. The offering will feature one and a half thousand performers from across the world, 900 horses, 25,000 spectators and a very special guest of honour.
We've met some of the acts taking part and we've been speaking to those who know the Queen personally.
Last-minute sound checks and rehearsals have been happening today in the main arena, ready for this evening's events. But the day started with the 73rd Royal Windsor Horse Show. Here's Mike Pearse.
William the Conqueror chose the site for Windsor Castle. It was high above the River Thames, on the edge of a Saxon hunting ground. Construction work began in the year 1070. The castle, built by the Queen's ancestor, draws people to the town in Berkshire.
Princess Elizabeth and her sister Margaret spent the Second World War living there. It was a fortress to keep them safe. But to the Queen it was and always has been home.
As a young princess the Queen was given the Freedom of the Borough in 1947, the first woman to be given the honour.
ITV Meridian presenter Sangeeta Bhabra has been meeting the people who work and live in the castle to find out why the royal residence is so special.
The Queen is Head of State to sixteen Commonwealth nations, and the show has been designed to reflect all of these countries.
Musicians, dancers, choirs, actors - and the military - all playing a part in this unique celebration - as ITV Meridian presenter Fred Dinenage has been finding out.
Queen Elizabeth II (centre) has been attending the third day of the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Berkshire. The next few days hold major celebrations to mark Her Majesty's 90th birthday.
More on the celebrations marking The Queen at 90.
The Royal Windsor Horse Show finally got underway today - but not without problems...or, in this case, mud!
Thousands of people were left disappointed when heavy rain meant yesterday's horse show - and rehearsals for the Queen's 90th birthday pageant on Sunday - were called off.
Ian Balding has trained thousands of horses over gallops in North Hampshire - many of them belonging to the Queen. He says that Her Majesty has 'natural horsemanship'.
A full list of events is taking place today in the Castle Arena, Frogmore Arena, Copper Horse Arena and Adelaide Arena.