The diminutive Italian won the St James 's Palace Stakes on horse Without Parole on the first of the five-day event which was attended by the royal family.
And when the royal newlyweds presented the confident jockey with the race trophy, Dettori leaned down and pecked a smiling Meghan on the hand.
Harry looked stony-faced as the 47-year-old athlete kissed his wife before wagging his finger at the 5ft4inch sportsman who received an honorary MBE in 2000.
Despite Frankie's nonchalance, he actually didn't break protocol as "there are no obligatory codes of behaviour when meeting The Queen or a member of the Royal Family", according to royal.uk.
But the horse rider was suspended and fined £4,300 for "using his whip above the permitted level from approaching two furlongs out" during his winning race.
The Duke and Duchess of Sussex were pictured smiling as they arrived in a horse-drawn carriage alongside the Count and Countess of Wessex this afternoon.
They were followed swiftly by the Queen, wearing a bright yellow jacket and matching hat, who was accompanied by her daughter, Princess Anne.
Meghan, wearing a elegant white dress and Harry in top and tails, waved to excited crowds who had packed out the race course in Berkshire.
Prince Charles and the Duchess of Cornwall were also spotted arriving at Royal Ascot with Princesses Eugenie and Beatrice travelling in another carriage, after.
Missing from the royal party was Zara Phillips and Mike Tindall, who announced the birth of their second child earlier today.
Meghan and Harry presented the winning trophy for the 4.20pm race, the St James' Palace Stakes, to the delight of winning jockey Frankie Dettori.
Their appearance at the eagerly anticipated race event came hours after Kensington Palace announced that their first official foreign trip as a couple would be to Dublin, in July.
Earlier today armed cops were seen patrolling the race track's bars and enclosures with security put on high alert ahead of the royal arrivals.
Recent race days have been marred by unsavoury booze-fuelled antics, with video footage emerging of a mass brawl between men at Ascot in May.
The incident took place a week after another man was filmed being kicked in the head during a fight at Goodwood races in Sussex.
Goodwood chiefs are so sick of the bad behaviour that they have limited punters to buying fours drinks one time. It is not thought that Ascot has taken similar measures.
Many are expected to take full advantage of the track's many bars by downing champagne at lager with sizzling conditions predicted as Britain prepares for a month-long heatwave.
Tropical conditions are expected to sweep the nation with the hottest June in 40 years predicted.
The Met Office has forecast a mainly sunny week ahead for most and “very warm or hot” days later in the month and up to July 15, with both the South and North sweltering.
Met Office forecaster Mark Wilson said: “Early signs are promising for later in June and July, with mainly dry and settled weather, particularly in the South, with likely very warm or hot conditions.
“The North will have bright days and plenty of drier and warmer interludes, although will be more changeable and with some cloud and rain.”
But it might take a bit to reach record-breaking temperatures, with the mercury needing to soar to 33C to hit unprecedented levels.
Despite the hot conditions, Royal Ascot is making sure racegoers respect tradition – and men thinking of wearing loafers without socks have be warned they will be turned away.
Rupert Adams from William Hill said: "Ascot have tightened up the dress code for the royal meeting and many of the millennial generation might not even own socks.
"The good news is we have 500 special edition socks in our shop on the high street which is close enough that you should not miss any of the action."
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