Strolling down The Long Walk as the sun beams down on Windsor Castle, you'd think Prince Harry and Meghan Markle were getting wed already.

The narrow cobbled streets of this 11-century town are swamped with grandiose horse processions, Union Jack flags and hundreds of royal fans camped out on the pavement for their chance to glimpse the newly-weds.

But today's excitable atmosphere was just the start – hundreds more people are set to descend on Windsor ahead of the Royal Wedding on Saturday.

Serious royal fans are already in the party mood.

American Donna Werner, 66, thinks nothing of travelling 3,000 miles from her home in New Fairfield, Connecticut to sleep on the streets outside the iconic castle ahead of the celebration, despite having a knee replacement just a few weeks ago.

Donna Werner who travelled over from the USA (
Image:
David Dyson)
Royal fans getting into the wedding spirit in Windsor (
Image:
GC Images)
The Ascot Landau carriage pulled by Windsor Grey horses, is taken past the Henry VIII gate during rehearsals (
Image:
AFP)

The grandma-of-five proudly dons glittery USA stickers on her cheeks and a t-shirt emblazoned with the slogan 'Prince Harry, I'm still available. Last chance!'

Donna, who has been camped out for two nights, when temperatures have dipped to a chilly 7c, says: “I have always loved England and the quaintness of the villages and thatched cottages and history, well I just love it.

"We have nothing like this in the States. It's magical.

“I am so thrilled that Harry is marrying Meghan – she will be our US princess.

“My family thinks I am nuts for sleeping out here, but it's worth it.”

Anne Daley with her dog Camilla (
Image:
Getty)
A dog called Camilla wears a 'bride to be' tiara (
Image:
David Dyson/Daily Mirror)
Military personnel rehearse their part in the procession (
Image:
REUTERS)

And it's not just people from the States who have flown over the Atlantic to see the American national sweetheart get married to her British Prince Charming.

Canadian Bernadette Christie, 64, keeps warm in a woolly red and white flag from her homeland, mixing up the patriotic outfit with Union Jack-painted hand and toenails.

“The Royal Family is part of our history too, because we are part of the Commonwealth,” she says.

“I am sleeping on the streets because the atmosphere is amazing, but it does get really cold at about 1am.”

Then there are stalwart British superfans Terry Hutt, 82, and John Loughrey, 63, who haven't travelled quite as far – but are unwavering in their dedication to the Royal Family.

They never miss a royal occasion, even in their older age.

Bernadette Christie from Canada (
Image:
Dinendra Haria/WENN)
Donna Werner thought nothing of travelling 3,000 miles to see the royal wedding (
Image:
David Dyson/Daily Mirror)

Terry, who beat the record for the amount of time camping out for royal occasions with an impressive 15 nights in front of the Lindo Wing for the birth of Prince Louis last month, has been sleeping outside the castle since Sunday.

Wearing his trademark head-to-toe Union Jack suit, complete with British flag-covered walking stick, tie and hat, says: “I will be outside camping for royal occasions until I’m 100 years old.”

The beautiful blue skies are a godsend to retired carpenter Terry, who slept in his favourite drenched Union Jack suit as it poured down during the Queen's Jubilee in 2012.

“I have been coming to royal events since I was four years old,” he says, proudly holding a poster made by his 12-year-old granddaughter Amber, showing cartoon Harry and Meghans grinning behind a huge love heart.

Members of the Household Cavalry take part in a rehearsal (
Image:
AFP)
The rehearsal has been taking place today (
Image:
Getty Images Europe)

“I think this wedding marks a change – Meghan and Harry are really modernising the royal family,” he says.

“Just like me and my wife Joy, for them it was love at first site. And we've been married 57 years.

I am sure they will follow in our footsteps.”Anne Daley, 62, from Cardiff, has taken the royal spirit to another level, dressing up her King Charles Spaniel Camilla (named after HRH, naturally) in a 'Bride to Be' crown.

“We invited Meghan to have her hen do in Cardiff so we thought we would dress for the occasion,” says Annie, who is wearing a long bridal veil and hot pink rosette.

The wedding has been good for local business, too.Gift shop Windsor Wine and Gifts, which looks out onto the castle, has had to order in hundreds more of their £9.99 replica Meghan wedding rings because so many people have wanted one of their own.

The Cold Stream Guards leaving the Victoria Barracks near Windsor Castle (
Image:
Paul Davey / SWNS.com)
The wedding will take place on Saturday (
Image:
REUTERS)

Shop assistant Evie Stevens says: “A man proposed to his girlfriend with one in the castle the other day. She said yes!”In coffee shop Heidi, off the main high street, the custom-made 'Megharryccino' has seen profits soar.

Barista Loic Marion, 18, says they ordered in a special machine – one of only three in the country – to make the coffees, with Harry and Meghan faces printed in the foam.

Sarah Atkinson 37, who lives in Windsor, is sat sipping her own unique cappuccino wearing a replica of the ring she bought the gift shop a few days earlier.

“This is a once-in-a-lifetime occasion for us all, so we should soak it up as much as we can,” she smiles, a slither of Megharrycccino foam on her top lip.