Queen Camilla was photographed meeting Henry Winkler as she attended Royal Ascot on Saturday.
The actor, who beamed as he shook hands with the royal, is best known for his role as The Fonz on Happy Days.
His appearance comes as the five-day event in Berkshire, which is a highlight of the social calendar, draws to a close.
There has been a strong royal presence at Ascot this year, with the King, 75, only missing one day (Wednesday) due to his ongoing cancer treatment.
However, the Queen, 76, was on hand to lead the procession until the monarch returned on Thursday.
HAPPY DAYS: Queen Camilla is pictured meeting Henry Winkler, best known for his role as Arthur ‘The Fonz’ Fonzarelli
The US actor and director was seen doffing his top hat as he shook hands with Queen Camilla
Queen Camilla and King Charles look tense as they watch the horse racing during day five of Royal Ascot
Camilla, who has been praised for her stylish ensembles throughout the event, wore a very pale blush coat for the fifth day of the races.
She paired it with a cream hat and pair of gloves, finishing her look with a statement choker featuring three strands of pearls.
The eye-catching piece, which features a purple centre stone, used to belong to the Queen Mother.
Meanwhile, the King, opted for a classic top hat and tails look, pairing a grey suit with a complementary pale grey waistcoat and lavender tie.
He finished off his outfit with black shoes, a large black umbrella, and a black top hat.
The royal couple led the carriage procession alongside Sheikh Hamad bin Khalifa Al Thani, the former emir of Qatar, and Lady Charles Spencer-Churchill.
This year’s Royal Ascot has been an eventful one, with a number of high-profile guests attending.
Zara and Mike Tindall, Princess Eugenie, Princess Anne and others were snapped watching the races.
DAPPER: the King and Queen look stylish as they attend the final day of Royal Ascot in Berkshire today
The King has attended four of the five days of Royal Ascot, only missing one due to his ongoing cancer treatment
The couple led the carriage procession, alongside Sheikh Hamad bin Khalifa Al Thani and Lady Charles Spencer-Churchill
Racing manager John Warren and Queen Camilla (both pictured) watch racing through binoculars
The American actor and director (pictured, left) appeared to be delighted at meeting Queen Camilla today (pictured, right)
At one point, Henry Winkler was seen clutching his phone and smiling, as it appeared he was taking a picture
Mrs Dominic Spencer-Churchill (pictured, right) attends day five of Royal Ascot on Saturday
Also in attendance was Lady Gabriella Windsor, who made her first official public appearance at the event, following the tragic death of her husband earlier this year.
And the Princess of Wales’ mother and father – Carole and Michael Middleton – attended the second day of Royal Ascot.
The outing marked their first public appearance since their daughter’s cancer diagnosis was made public.
While Prince William was seen spending time with his in-laws that day, his wife Kate Middleton was not present, due to her ongoing treatment for cancer.
However, several days earlier, Kate had made her own spectacular return to public life, at Trooping the Colour on Saturday.
The dapper couple appear to have enjoyed this year’s event, with Camilla attending all five days
King Charles (pictured) only missed one day of Royal Ascot this year, which was due to his ongoing treatment for cancer
Despite concerns that Royal Ascot might lose some of connection with the Royal Family following the death of Queen Elizabeth II, the King has been a strong presence at both of the events so far during his reign
Dressed in their finery, the beaming Middletons looked in good spirits as they arrived side-by-side for the prestigious event at the Berkshire racecourse.
Prince William, who led the royal carriage procession along side Queen Camilla in the absence of his father on day two of the society event, spent time chatting to his mother and father-in-law ahead of the races beginning.
Royal Ascot was established in 1711 by Queen Anne, who described Ascot as the perfect place for ‘horses to gallop at full stretch’. It has been a highlight of the racing calendar since, as well as the royal calendar.
The event a favourite of the late Queen Elizabeth II, who rarely missed it. After her death, some thought its connection with the Royal Family may have been affected.
However, King Charles has been to Royal Ascot both of the years he has been monarch, even seeing his horse Desert Hero clinch an unlikely victory in the King George V Stakes last year.
