Queen Camilla was pictured meeting Henry Winkler while attending Royal Ascot on Saturday.
The actor, who smiled as he shook the royal’s hand, is best known for his role as The Fonz in Happy Days.
His appearance comes as the five-day event in Berkshire, which is a highlight of the social calendar, comes to an end.
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 present to lead the procession until the monarch returned on Thursday.
HAPPY DAYS: Queen Camilla is shown meeting Henry Winkler, best known for his role as Arthur ‘The Fonz’ Fonzarelli.
The American actor and director was seen taking off his top hat while shaking hands with Queen Camilla.
Queen Camilla and King Charles look tense as they watch the horse races 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 racing.
She paired it with a cream hat and a pair of gloves, and completed her look with a statement choker with three strands of pearls.
The striking piece, which features a purple center stone, belonged to the Queen Mother.
Meanwhile, the King opted for a classic top hat and tails look, pairing a gray suit with a complementary pale gray waistcoat and lavender tie.
She completed her 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, former emir of Qatar, and Lady Charles Spencer-Churchill.
This year’s Royal Ascot has been an eventful event, with several high-profile guests in attendance.
Zara and Mike Tindall, Princess Eugenie, Princess Anne and others were photographed watching the races.
DAPPER: The King and Queen look elegant as they attend the final day of Royal Ascot in Berkshire today
The King has attended four of the five days of Royal Ascot, missing 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 director John Warren and Queen Camilla (both pictured) watch the races through binoculars.
The American actor and director (pictured, left) seemed delighted to meet Queen Camilla (pictured, right) today
At one point, Henry Winkler was seen holding his phone and smiling, as if he was taking a photo.
Mrs Dominic Spencer-Churchill (pictured right) attends day five of Royal Ascot on Saturday.
Also present 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’s parents, Carole and Michael Middleton, attended the second day of Royal Ascot.
The outing marked her first public appearance since her daughter’s cancer diagnosis became 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 cancer treatment.
However, several days earlier, Kate had made her spectacular return to public life, at Trooping the Color on Saturday.
The stylish 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, due to his ongoing cancer treatment.
Despite concerns that Royal Ascot may lose some of its connection with the Royal Family following the death of Queen Elizabeth II, the King has had a strong presence at both events so far during his reign.
Dressed in their finest, the beaming Middletons seemed in good 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 his father’s absence on the second day of the social event, spent time chatting with his mother and father-in-law before the races began.
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 actual calendar.
The event was a favorite of the late Queen Elizabeth II, who rarely missed it. Following her death, some thought her connection to the Royal Family may have been affected.
However, King Charles has been at Royal Ascot both years he has been monarch, and even saw his horse Desert Hero take an unlikely victory in the King George V Stakes last year.