Queen Camilla was photographed meeting Henry Winkler while visiting Royal Ascot on Saturday.
The actor, who beamed as he shook hands with the royal family, is best known for his role as The Fonz in Happy Days.
His appearance comes as the five-day event in Berkshire, a highlight of the social calendar, comes to an end.
There was a strong royal presence at Ascot this year, with the king, 75, missing just 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 meets Henry Winkler, best known for his role as Arthur ‘The Fonz’ Fonzarelli
The American actor and director was seen removing his top hat as he shook hands with Queen Camilla
Queen Camilla and King Charles watch the horse racing on day five of Royal Ascot
Camilla, who was praised for her stylish ensembles at the event, wore a very pale, blush coat on the fifth day of the races.
She teamed it with a cream hat and a pair of gloves and completed her look with a statement choker with three strings of pearls.
The striking piece with a purple center stone used to belong to the Queen Mother.
Meanwhile, the king opted for a classic top hat and tails look, pairing a gray suit with a complementary light gray waistcoat and lavender tie.
He completed 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 was an eventful event, with a number of high-profile guests.
Zara and Mike Tindall, Princess Eugenie, Princess Anne and others watched the races.
BRAVE: The King and Queen look stylish as they attend the final day of Royal Ascot in Berkshire today
The King attended four of the five days of Royal Ascot, but missed only one due to his ongoing cancer treatment
The couple led the carriage procession, along with Sheikh Hamad bin Khalifa Al Thani and Lady Charles Spencer-Churchill
Race manager John Warren and Queen Camilla (both pictured) watch the racing through binoculars
The American actor and director (pictured, left) seemed delighted when he met Queen Camilla today (pictured, right)
At one point, Henry Winkler was seen holding his phone and smiling as it looked like he was taking a photo
Mrs Dominic Spencer-Churchill (pictured, right) attends the fifth day 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 mother and father of the Princess of Wales – 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 spent time with his in-laws that day, his wife Kate Middleton was not present due to her ongoing cancer treatment.
However, just days earlier, Kate had made her own spectacular return to public life, during Trooping the Color on Saturday.
The dapper couple appear to have enjoyed this year’s event, with Camilla attending all five days
King Charles (pictured) missed just one day of Royal Ascot this year due to his ongoing cancer treatment
Despite concerns that Royal Ascot could lose some of its connection with the royal family following the death of Queen Elizabeth II, the King has maintained a strong presence at both events during his reign so far.
Dressed in their finery, the beaming Middletons looked in high spirits as they arrived side by side for the prestigious event at Berkshire Racecourse.
Prince William, who led the royal carriage procession alongside Queen Camilla in the absence of his father on day two of the society event, spent time chatting with his mother and father-in-law before the races started.
Royal Ascot was founded in 1711 by Queen Anne, who described Ascot as the perfect place for ‘horses to gallop at full speed’. Since then it has been a highlight of the racing calendar, as well as the royal calendar.
The event was a favorite of the late Queen Elizabeth II, who rarely missed it. After her death, some thought that ties with the royal family may have been damaged.
However, King Charles has been to Royal Ascot both years he was monarch and even saw his horse Desert Hero take an unlikely victory in the King George V Stakes last year.
