The Queen rarely misses attending the Epsom Derby, which is one of the highlights of the racing calendar. Unlike last year, the Queen does not have a horse entered in the Derby, or the other six featured races.
This year, however, the Jubilee celebrations created an extra air of excitement, despite the grey and drizzly conditions.
Anthony Cane, Epsom Downs Racecourse chairman, said: "At the end of the day, her love is to come here.
"You have to remember, she comes here in a normal year in a private capacity not on an official visit. But she comes because she loves it, and this time it's her one trip to Surrey in the Diamond Jubilee."
Speaking about the Queen's passion for all things equestrian, he said: "She's incredibly knowledgeable. Her knowledge of thoroughbreds and breeding goes way back. She's absolutely amazing."
The Queen dressed in a white silk dress with a blue floral print and a royal blue crepe wool coat by Stewart Parvin and matching hat by Rachel Trevor Morgan.
Like other racegoers at Epsom, she seemed undaunted by the grey weather conditions.
Many of the spectators waved Union flags and lined the Queen's route into the stand, named in her honour and opened by the monarch in 1992.
The event had an added carnival atmosphere with stilt walkers dressed as guardsmen complete with scarlet tunics and imitation bearskins amusing the racegoers.
Welsh singer Katherine Jenkins sang the national anthem as the Band of Her Majesty's Royal Marines Portsmouth played and when it ended, a huge cheer went up.
A host of famous names also joined the racegoers: Donna Air, Mischa Barton, Phil Tuffnell and Matt Dawson, while London 2012 was recognised with the Great Britain women's hockey team present.
Meanwhile Labour leader Ed Miliband took to the social networking site Twitter to welcome moves to rename the tower housing Big Ben in honour of the Queen.
He said: "On Diamond Jubilee weekend, welcome news the Clock Tower looks like being renamed Elizabeth Tower."