It may be an exciting day for some, but for others the occasion is bittersweet.

Patrick Adams - who became Meghan's on-screen husband as they made their exit from hit television programme Suits in April - posted this picture on Instagram of the show's co-stars enjoying a "last supper" ahead of Meghan's real wedding today.

He later shared on Twitter, external some sweet words for the couple before they get wed, urging them to "love deeply and live well".

Etiquette expert Liz Brewer provides tips for those lucky enough to be invited.

Prince Harry has been given a Scottish title by the Queen.

He becomes the third Earl of Dumbarton - a title that has strong military connections.

The title has not been used since 1749.

On her marriage, Meghan Markle will become the Countess of Dumbarton.

Image source, AFP

Fashion insider Jo Elvin, editor of You magazine, has been talking to BBC News about that dress.

She believes "a surprise is on the way in some form".

Yesterday designer Caroline Castigliano told Page Six, external that she believed Stella McCartney would be the designer of Meghan's wedding dress.

"Stella is such a perfect fit for Meghan, she uses organic fabrics and her ethos is the same as Meghan. Her style is very underplayed, her dresses are very clean in style, very much Meghan - and they are friends," Castigliano is quoted as saying.

Others in the running include British designers Ralph & Russo, while Burberry's Christopher Bailey "is very much on the watch list", accordign to Elvin, ahead of his departure from the British label at the end of the year.

The fact that Meghan wore a Roland Mouret dress as she arrived at Cliveden House Hotel with her mother last night appears to have ruled Mouret out of the running, according to some fashion pundits.

But others think it might be a hint.

The guessing game continues (for at least another few hours...)

Theresa May may not be on the guest list today - no politicians have been invited - but that hasn't stopped her sending her best wishes to Harry, Meghan and everyone else joining in the festivities.

BBC Radio 5 live

Image source, Getty Images

Christopher Warren-Green will be conducting the orchestra for the wedding, as he did for Charles and Camilla, and William and Kate.

5 live's Rachel Burden spoke to him on his way in to the chapel: "It's stunning and there's quite a hand from the Prince of Wales in there, he's a great music lover."

Asked if he gets nervous on occasions like this, he said: "I've got a fantastic orchestra, I'm only really worried about timings and getting it right for them - that's all."

Image source, AFP

The couple has invited 1,200 members of the public to the grounds of Windsor Castle for the wedding, and they've been arriving over the past few hours.

A selection of charity workers, school children, royal household members and Windsor residents have made the cut.

Twelve-year-old Amelia Thompson, who was injured in the Manchester Arena attack, will be among the guests.

Here are the stories of three of those who have been invited.

Hanna Yusuf
in Windsor

Neighbours Rakhi Morgan, Suzanne Passfield and Anne Palmer travelled together from Shepperton, Surrey, with all the key essentials - like bubbles.

“We’ve got our Prosecco!” cheered Anne Palmer. “We’ll be cheering them on as they go past.”

They believe the wedding is a welcome distraction.

“We need something to make us happy, don’t we,” said Rakhi Morgan.

The trio, who have been waiting by the Long Walk since around 07:00 BST, are looking forward to toasting the happy couple during the procession.

They believe Harry and Meghan are well-matched.

“Harry needs taming, and Meghan will do that,” said Ms Palmer.

Ahead of Radio1's Royal wedding coverage, Matt Edmondson enlisted some help to imagine what the Prince Harry's speech could look like.

McFly's Tom Fletcher - accompanied by a team of lookalikes - has acted out his version of the big day...

Image source, Reuters

The BBC's Rozina Sini is in Windsor today and she's been answering readers' questions on social media.

You can watch her Facebook Live here., external

World-renowned wedding gown designer Caroline Castigliano shares her top tips on how to dress a royal bride. They are:

• Consider the bride's personality
• Remember to nod to tradition
• Think about the wedding location

Listen to her advice above.

Image source, Getty Images

A screen has been set up at Camp Qargha Nato base in Afghanistan - for British and Nato troops to watch the wedding.

The base, just outside the Afghan capital Kabul, is home to more than 150 British troops.

Hanna Yusuf
in Windsor

Janet Butterfield and Ray Brown from Bradford, Yorkshire, left their home city in the early hours of Saturday morning, external to arrive in good time for Meghan and Harry’s big day. They caught the last train out of York to get as close to Paddington as possible at around 01:00 BST, external, and then caught a bus to Paddington to then wait for three hours for the first train to Windsor. They have been in Windsor since 05:00 BST on Saturday, external. “It was dark when we got here,” said Mr Brown. “And it was very cold,” added Mrs Butterfield, “but it’s warming up now.” “The atmosphere here is tremendous!” said Mrs Butterfield. “And this is more intimate. I was there for Kate and William’s wedding, and this is much more intimate because it’s smaller. “I feel like I’m nearer to it,” she said.“You feel like you’re part of it,” added Mr Brown. They’re really looking forward to seeing the procession and Meghan’s dress. “It’ll be nice to know if it was made by a British designer,” said Mr Brown.

Image source, Sheryll Perrine

Sheryll Perrine from London is in position outside the entrance to Windsor Castle on Castle Hill.

"I got my spot and I didn’t need to spend the night outside to get here!"

Are you in Windsor or having a Royal Wedding party? Email: haveyoursay@bbc.co.uk or tweet @BBC_HaveYourSay, external with your pictures.

• You can watch the big day unfold on BBC One with Kirsty Young, Huw Edwards and Dermot O'Leary from 09:00 BST
• Chris Evans is live from Windsor for BBC Radio 2
• You can also watch a live stream of the wedding on this page
• If you miss any of it, BBC Two will be showing the highlights of the day from 18:30-20:00

The BBC has waived the TV licence fee for public screenings, meaning street parties and other special events can screen the wedding live without buying a licence.

Image source, BBC FOOD

Now we have learnt that Prince Harry and Meghan Markle have been given the titles Duke and Duchess of Sussex, here's a short guide to all things Sussex.

From Sussex pond pudding to the Sussex Downs, the county offers all manner of entertainment.

Highlights include the Brighton Pavilion and Beachy Head, while Dame Vera Lynn, Gruffalo author Julia Donaldson and DJ Fatboy Slim are among the famous residents.

Meghan Markle's father, Thomas, is unable to attend the wedding, after undergoing heart surgery - but his name still appears on the order of service available to download on the royal website.

Prince Charles will stand in for Meghan's father and walk her up the aisle at St George's Chapel.

Image source, Getty Images

The last man to hold the title of Duke of Sussex was Prince Augustus Frederick, the sixth son and ninth child of George III.

Like Harry and Meghan, the duke lived in Kensington Palace. He died in 1843, aged 70.

Augustus twice married for love, but his father did not approve of either match and so did not give his consent to either marriage.

As a result, neither of the duke's children were considered legitimate heirs to his title.

BBC Radio 5 live

Captain Piers Flay is Troop Leader of the Blues and Royals, the Household Cavalry - Prince Harry’s former regiment.

So, will Harry be wearing a Blues and Royals uniform for the ceremony?

Captain Flay told 5 live: “It’d be lovely to see him in that but it’s his prerogative – we will see.”

He said the regiment will be taking part in the ceremony: “You’ll see the Blues and Royals and the Life Guards lining the steps as they [Harry and Meghan] leave the chapel."

And he said two of the soldiers who served with Harry are on the parade today.

The Archbishop of Canterbury Justin Welby, who will officiate the wedding ceremony, has said he is "praying for Prince Harry and Meghan Markle" on what he hopes will be "a day of joy and celebration".