Her Majesty, wearing light blue, led the Royal procession of carriages to officially open the race meeting yesterday (Tuesday).
Other Royal figures taking part in the procession around the parade ring included The Duke of Edinburgh, Prince Charles, Camilla, Duchess of Cornwall, and Prince Harry.
Joining them were the Duke and Duchess of Gloucester, the Duke of York, Princesses Eugenie and Beatrice, and Prince and Princess Michael of Kent.
Sylvia Sanders and friend Carol Gaunt, both from Sunninghill, attended the opening day of the races. Ms Sanders said: “We come every year, and it’s lovely weather.
“We’ve been really excited to come for a while, and we’re looking forward to placing a few bets and especially the champagne and strawberries!”
Lyndl Harrison, from Sunningdale, is a veteran of the races, and said: “This is my fifth year here, and I’m really excited to be here, it’s great to see all the incredible hats on show, and the thrill of betting once a year.
“It’s very special to be here and as always it’s great to be able to dress up.”
Nick Smith, the racecourse's head of communications and international racing, said: "It was a wonderful day and the crowd has enjoyed some spectacular racing in fine weather.
"It was brilliant to watch Toronado and Kingman stamp their dominance on different generations over a mile, we saw an outstanding new two-year-old - The Wow Factor - win the Coventry Stakes, Sole Power showed electric acceleration to take the King's Stand Stakes for the second time and we've ended with another winner for America.
"We have made a wonderful start and today we welcome the best filly in the world, Treve, who runs in the Prince Of Wales Stakes. It will be a big day for Frankie Dettori and fantastic for British racing fans to see her running in this country for the first time."