In pictures: Ladies' Day at Royal Ascot 2013
Queen makes sporting history as first reigning monarch to win Royal Ascot's Gold Cup, while Britain's golden girl Victoria Pendleton plays dress up
The Queen stole the show on Ladies' Day at Royal Ascot 2013 - but female racegoers did not fail in their bid to grab the attention of photographers.
While Her Majesty beamed as her thoroughbred filly Estimate finished first in the Gold Cup, the racecourse was again a sea of colourful and outlandish hats.
Two fashion students wore creative headpieces, with one inspired by the Duke and Duchess of Cambridge's impending baby and the other by the Forces charity Help For Heroes.
Gabriele Dirvanauskas's hat featured nappies and gold-coloured rattles, bottles and dummies topped off with a small crown.
The 23-year-old said: "I was working on this three hours a night for a week. I'm very excited by the royal baby and I hope it's a girl."
Her friend, Joely Chilcott, 24, wore a hat that featured three jets from the Red Arrows streaking off into the heavens and the Help For Heroes emblem.
She said: "I just wanted to show my support on Ladies' Day in light of recent events."
There was also the rare sight of a guide dog wearing a tiny Mexican hat decorated with colourful ribbons.
Zoey, a five-year-old Labrador-retriever cross, was guiding her blind owner, David Adams, who was with his wife, Judith.
Mr Adams, 68, joked: "It says in the rules that ladies have to wear a hat so we made sure she had one, but she doesn't wear it when she's working."
Victoria Pendleton, Britain's golden girl of track cycling, described her delight at wearing feminine clothes as she enjoyed the atmosphere at Royal Ascot.
She said: "I love dressing up and wearing a dress. It's a whole new world for me to wear heels and a frock."
The sportswoman brought a glittering career in bike racing to a close at London 2012 by retiring after winning a keirin gold and sprint silver last summer.
She wore a red hat featuring a rose by royal milliner Philip Treacy and a poppy print dress by Paul Smith.
Entertainer Sir Bruce Forsyth, who is a regular at Royal Ascot with his wife, Wilnelia, said: "We come every year, it's one of the few days we get to go out together.
"But it's a great day out - you can dress up and enjoy yourself."
Other famous faces at the racecourse were doyenne of baking Mary Berry and singer Pixie Lott.
Queen ecstatic at Gold Cup victory
The Queen made sporting history today when she became the first reigning monarch to win Royal Ascot's Gold Cup - and described the experience as a very big thrill.
With a clap of her hands and a beaming smile, she celebrated the moment her thoroughbred filly Estimate finished first, as her family jumped for joy behind her in the royal box.
Princesses Beatrice and Eugenie had joined their grandmother for a day at the races and could not contain their excitement during the dramatic finish.
The Queen's smile lasted long after her horse crossed the finish line and she was still beaming when she joined jockey Ryan Moore and trainer Sir Michael Stoute in the winners' enclosure for the trophy presentation.
Today's victory is the Queen's biggest win since her horse Dunfermline ridden by jockey Willie Carson won the classic races - the Oaks and St Leger - in her Silver Jubilee year 1977.
Sir Michael said the Queen greatly appreciated the victory: "It's a special thrill to win this race for the Queen and it will have given her enormous pleasure - she really loves this game and it's a great recreation for her.
"She told me it was a very big thrill and thanked everybody involved."
The Queen has been a passionate horse owner and breeder for much of her 61-year reign and even whiled away her 87th birthday in April, at the yard of a west country trainer, casting her eye over thoroughbreds.
Her horses have also won four out of the five flat racing classics - the 1,000 Guineas and 2,000 Guineas, the Oaks and the St Leger - with only the Derby eluding her.
Estimate's victory was the first time a reigning monarch has won the Gold Cup in its 207-year history.
The Queen was hoping her horse would surpass its achievements of last year when she won the Queen's Vase at Royal Ascot.
But Estimate lived up to her billing as pre-start favourite and, as the race over 4,000 metres drew to a close, she made her way from the middle of the pack, took on the front runners and beat them to the line.
The victory is an added boost for the Queen, who has been attending the famous annual meet this week without the Duke of Edinburgh, who is convalescing at Windsor Castle after exploratory abdominal surgery.
Still wearing the Queen's racing silks of purple and scarlet with gold braiding, jockey Moore said of Estimate, the 7-2 favourite: "She won well, and to do it for the Queen is fantastic.
"To win the Gold Cup in her colours is exceptional."
The Queen was scheduled to hand out the winning trophies for the Gold Cup but the Duke of York, part of the royal party, stepped in to do the duties.
Prime Minister David Cameron also praised the Queen's win in a tweet: "Huge congratulations to Her Majesty for Estimate's victory at Royal Ascot - first time ever a reigning monarch's horse has won the Gold Cup."
William Hill said it was left reeling after the win as it had paid out £1.5 million to punters who backed Estimate.
The bookmaker said odds for the Queen's horse were 7-1 this morning before shortening to 5-1, while at Royal Ascot it was also the favourite with odds of 7-2.
A spokeswoman said: "This was a true patriotic punt on the Queen's runner Estimate, and her victory has handed us a stinging £1.5 million payout.
"Her Majesty is flying the flag for British bettors today."
Despite scooping £155,960 in prize money as the owner, the Queen will not have made anything from a small wager as she does not bet.