The happy couple will be wed the Archbishop of Canterbury on Saturday 19th May at 12:00 BST in St George's Chapel before travelling through Windsor in an Ascot Landau carriage.
The carriage will leave Castle Hill and travel through Windsor along a route including High Street, Sheet Street, Kings Road, Albert Road and then proceed up the Long Walk all the way back to St George's Hall by Windsor Castle.
Six hundred guests, including the Spice Girls, have been invited to the ceremony with a further 200 invited to the couple's evening reception.
All wedding guests will attend a lunchtime reception at St George's Hall, which is being given by Her Majesty The Queen.
Ms Markle is reportedly planning to break with the tradition for royal brides by making a speech.
Over 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.
Kensington Palace had previously said Ms Markle's father, Thomas Markle, would walk his daughter down the aisle, however, it is currently unclear whether he will attend the wedding as planned. The Palace have issued a statement asking for "understanding " to be extended to Mr Markle in this "difficult situation".
Ms Markle's mother, Doria Ragland, is expected to arrive in the UK the week before the wedding to meet senior royals including the Queen, the Duke of Edinburgh and the Duke and Duchess of Cambridge.
From Prince Harry's side of the family, Kensington Palace confirmed the Queen's husband, the Duke of Edinburgh, will attend despite recently recovering from a hip replacement.
Prince Harry's newest nephew, Prince Louis, will not be there as he will only be three weeks old at the time.
US President Donald Trump, who acts like he's three weeks old, will also not be in attendance.
It has been confirmed that Barack and Michelle Obama, who are friends of the prince, have not received an invitation.
Ms Markle will spend her last night before her wedding with her mother, Doria Ragland, at the luxury Cliveden House Hotel in Berkshire, which is about nine miles north of Windsor Castle.
Prince Harry will be staying 15 miles away at the Dorchester Collection's Coworth Park in Ascot, with his brother and best man, the Duke of Cambridge before travelling to the chapel together on the day.
Ms Markle will arrive at the chapel by car with her mother.
The dress code listed on the royal invitation requests a "morning suit or lounge suit" for men, and a "day dress with hat" for women.
That means shirts, suits and ties with the possibility of top hats and waistcoats for men. Women will be expected to opt for knee-length dresses, with hat choices similar to those found at Royal Ascot.
The details of Ms Markle's wedding dress remain a mystery.
Ms Markle will not have a maid of honour and Kensington Palace have said all of her bridesmaids and pageboys will be children.
The couple have chosen a selection of choirs, soloists, and musicians to perform at their wedding.
Kensington Palace has announced these will include the Choir of St George's Chapel, 19-year-old cellist Sheku Kanneh-Mason who won the 2016 BBC's Young Musician, and gospel group Karen Gibson and The Kingdom Choir.
An orchestra - fronted by Welsh soprano Elin Manahan Thomas - will also perform. She will be accompanied by trumpet player David Blackadder, organ player Luke Bond and State Trumpeters from the Band of the Household Cavalry.
Later in the evening, the newlyweds will celebrate with 200 guests at a private reception less than a mile from Windsor Castle at Frogmore House, hosted by Prince Charles.
The 17th Century country house and gardens, a former home to numerous royals throughout history, was the back drop for the pair's engagement photos.
The Royal Family will pay for the wedding, including the service, music, flowers and reception.
The date and location of the honeymoon have not been released yet but Kensington Palace said it will not start immediately. They will, however, carry out their first royal engagement as a married couple in the week after the wedding.
Pubs and bars across England and Wales will be allowed to serve until 1am on the morning of the wedding day, and again after the couple are married.
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