So, Harry becomes the Duke of Sussex with immediate effect but Meghan will not become the Duchess of Sussex until they are married.

The Queen has also made her grandson Earl of Dumbarton and Baron Kilkeel.

A Buckingham Palace statement read: "The Queen has today been pleased to confer a Dukedom on Prince Henry of Wales. His titles will be Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.

"Prince Harry thus becomes His Royal Highness The Duke of Sussex, and Ms. Meghan Markle on marriage will become Her Royal Highness The Duchess of Sussex."

Prince Harry and Meghan Markle have been given the titles Duke and Duchess of Sussex.

The flowers are in place in St George's Chapel as the countdown to the service begins.

Image source, Getty Images

Image source, Getty Images

Every royal wedding is different. But every royal wedding is an opportunity, in some way, to relaunch the Royal Family, writes BBC royal correspondent Jonny Dymond.

Big weddings like this come along pretty rarely and they are now the object of global fascination.

So it represents a great opportunity to say: "This is who the Royal Family are these days."

But this is a very different royal wedding.

It's different because of the style of the arrangements for the day itself.

From small things, like the cake (not a traditional big heavy fruitcake covered with bullet-proof icing), to bigger things, like a gospel choir performing at the service.

To more remarkable decisions, like the invitation to 1,200 members of the public to enjoy the occasion in the grounds of Windsor Castle.

After the death in 1997 of Prince Harry's mother, Diana, Princess of Wales, she was described by the-then prime minister Tony Blair as "the people's princess".

This may not be "the people's wedding", but it is about as close to it as any royal wedding has got.

Read more here.

Image source, Getty Images

There will be a carriage procession through Windsor straight after today's ceremony.

Fiona Bruce explains what will be happening - and where to find the best spot on the procession route.

It's not even eight in the morning but already Windsor is filling up.

Some hardy fans spent the night along the procession route while many more are arriving in trains, cars and coaches from around the country.

Image source, PA

Image source, PA

Image source, PA

Image source, PA

The BBC's Naga Munchetty is taking a bit of stick for her choice of outfit today...

BBC Radio 5 live

Image source, Karen Murdoch / Goff Photos

Karen Anvil took a photo of Harry and Meghan (with William and Kate) going to church in Sandringham on Christmas Day 2017.

The photo went viral and today Karen's in Windsor for the wedding.

She said: "I took that one photo thinking, 'Oh, I'll show that to my mum when I get in,' but it captured a moment... and changed my life."

Karen's going to be 5 live's unofficial wedding photographer for the day and she's already been busy....

Image source, Karen Anvil

Invitations were sent to 600 guests, with a further 200 invited to the couple's evening reception - including the Spice Girls.

Ms Markle's father, Thomas Markle, will not attend the wedding, following recent reports that he had to undergo heart surgery.

Ms Markle's mother, Doria Ragland, arrived in the UK on Wednesday, and met the Queen and the Duke of Edinburgh on Friday.

From Prince Harry's side of the family, Kensington Palace has confirmed the Queen's husband, the Duke of Edinburgh, will be attending, despite his recent hip replacement.

But Harry's newest nephew, Prince Louis, who is three weeks old, will not be there.

Prime Minister Theresa May and Labour leader Jeremy Corbyn are not on the guest list after it was decided there would not be an "official list of political leaders".

More than 1,000 members of the public have been invited to the grounds of Windsor Castle and will be able to watch the arrival and departure of the bride and groom.

Image source, Getty Images

BBC Afghan correspondent Secunder Kermani has been speaking to troops who knew Harry about the big day.

Lieutenant Colonel Dai-Bevan, who served in Helmand alongside the prince, says: “Prince Harry has got a strong connection with us having served with us in Afghanistan so all of us feel a particular affinity with him and are very much behind him on this special weekend."

Company Sergeant Major Steve Young, who trekked to the North Pole with Harry, said: "We all get some jittery nerves before a wedding, I certainly did. I’m sure he will as well. So I wish him all the best from myself and all the boys."

Image source, Getty Images

The big day is finally here, but how will it unfold?

08:00 BST Invited members of the public start to gather on a lawn outside the chapel from where they'll watch the royals come and go.

09:30 Chapel guests begin to arrive and must be seated by 11:15.

12:00 The service in St George's Chapel gets under way in front of the 600 or so guests.

13:00 The newlyweds travel in an open carriage as part of a 25-minute procession from St George's Chapel through Windsor town.

Afternoon: There will be a reception at St George's Hall for the couple and their guests.

Evening: Prince Charles will give a private reception at Frogmore House for the couple and 200 close friends and family.

Today marks a new chapter in the lives of Prince Harry and Meghan Markle - and the couple are expected to receive new titles ahead of their wedding.

As well as being made Duke and Duchess of Cambridge, William and Kate were given the Scottish titles Earl and Countess of Strathearn - seen as a nod to their time at the University of St Andrews - and the Northern Irish titles of Baron and Baroness of Carrickfergus.

So, what are Harry and Meghan likely to receive?

Image source, PA

BBC Radio 5 live

A lottery winning couple have spent £5,000 on a Windsor Castle kennel so that their dog Archie can join the royal wedding celebrations.

Susan and Michael Crossland from West Yorkshire have even installed a doggy hot tub and throne for their pampered pooch....

Thames Valley Police has issued travel advice for the day.

Those travelling by car may be stopped by roads policing officers.

British Transport Police will be patrolling train stations and key transport hubs.

A screening and search regime will be in operation in Windsor

A series of road closures are planned on Saturday 19 May 2018 - a map of diversion routes can be found at Roadworks.org.

There are 6,000 car parking spaces available at the Review Ground, Windsor Great Park which will need to be pre-booked.

Windsor has two railway stations - Windsor and Eton Riverside and Windsor and Eton Central - both of which are expected to be extremely busy despite expanded timetables.

Image source, Getty Images

Prince George will be a page boy and Princess Charlotte, a bridesmaid but who will be the other children accompanying Meghan Markle into the chapel?

The bridesmaids will be:

• Harry's goddaughter Zalie Warren, two, the daughter of Jake Warren, the Queen's bloodstock and racing adviser
• Also one of Harry's goddaughters, three-year-old Florence van Cutsem - daughter of Mrs Alice van Cutsem and Major Nicholas van Cutsem
• Ms Markle's goddaughters, sisters Remi and Rylan Litt, aged six and seven respectively
• Four-year-old Ivy Mulroney, the daughter of Meghan's close friend Jessica Mulroney

... and the pageboys:

• Harry's six-year-old godson Jasper Dyer, the son of Harry's mentor Mark Dyer
• Mrs Mulroney's seven-year-old twin sons Brian and John Mulroney.

Kensington Palace announced that Ms Markle would not have a maid of honour because she did not want to chose one person from her group of friends.

Image source, Getty

Image source, PA

Image source, PA

The Guardian has printed a poem, external from the poet laureate Carol Ann Duffy commemorating the occasion.

It should be private, the long walk

on bereavement’s hard stones;

and when people wave, their hands

should not be mobile phones,

nor their faces lenses;

so your heart dressed in its uniform.

On. Then one blessed step

and the long walk ended

where love had always been aimed,

her arrows of sweet flowers gifting

the air among bells - yes, they all looked -

and saying your name.