The Queen's favourite grandson Peter Phillips arrived with his new girlfriend at the Epsom Derby on Saturday.
Peter arrived at the racecourse with his new partner Lindsay Wallace, sister Zara Tindall and their mother Princess Anne for the third day of Platinum Jubilee celebrations.
The businessman, who is the Queen's eldest grandson, wore black tails with a traditional top hat and a "Royal Box" tag hanging from his blazer to the Surrey racecourse.
While girlfriend Lindsay stood out in a coral dress with a decorative cream fascinator and her blonde locks swept bag into a neat bun.
The Queen was introduced to Peter's new girlfriend earlier this year following his divorce from ex-wife Autumn.
It is understood that the monarch met with Lindsay following a shooting party held at Windsor in a sign the couple "are serious."
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The royal introduction came almost two years after Peter announced his separation from Autumn with their divorce finalised last June.
A royal insider told how the Queen is "one of the most important people in Peter's life" so it is "only right" that he introduces his new girlfriend to her.
"It was a very warm meeting and the Queen was clearly delighted to meet someone who makes Peter so happy," a source told The Sun.
“It may still be early days but Peter wanted his grandmother to see he was happy.
"It is a clear sign that Lindsay has now been firmly welcomed into The Firm and a major first step if they were to ever choose to get married."
The Princess Royal is representing her mother the Queen at the Derby which is one of Her Majesty's favourite events.
None of the monarch's horses will be running this year and she will instead watch the event on TV from Windsor.
The Queen had been due to attend the event but was forced to pull out because of mobility issues.
Her Platinum Jubilee weekend has seen the country turn out to celebrate 70 years of her reign.
But this year has seen continuing concerns about the 96-year-old monarch's health, with the Derby becoming the second jubilee event she has been forced to miss.
Her Majesty was also unable to attend the Thanksgiving service at St Paul's on Friday but appeared twice on the balcony for the opening of the celebrations earlier in the week.
Zara's husband Mike Tindall and Princess Anne's husband Sir Tim Laurence accompanied the royal trio to the racecourse.
The Princess Royal and her husband were seen waving and smiling from the balcony to welcome the crowds.
Peter is the son of Princess Anne and her first husband Captain Mark Phillips.
The 44-year-old and his sister Zara also have a less-known half sibling, Stephanie Phillips, who was born to Mark and his second wife Hawaiian equestrian Sandy Pflueger.
Royal insiders claim that Peter is the monarch's "favourite" grandson who is currently 18th in line to the throne.
Peter and his sister Zara have never held HRH status and previously faced scrutiny over how they make their money.
