Royal experts have hailed the ceremony as "ground-breaking", saying the couple has thrown the Royals into the 21st century.
It has been announced that they will live in Nottingham Cottage at Kensington Palace.
"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." But according to Royal expert Imogen Lloyd Webber, she will not immediately become Princess Meghan because you can’t become royal through marriage.
They could have become the Duke and Duchess of Clarence or Buckingham as both are available after the line died out, so they are in the Queen’s gift to bestow.
During the ceremony, Harry told his blushing bride "you look amazing" and whispered "I've missed you" in a union that brought a measure of modern Hollywood glamour into the 1,000-year-old monarchy.
In a service that combined modernity and the ancient rituals of a royal house that dates back to 1066, Prince Charles, heir to the throne and Harry's father, accompanied Markle to the altar from the middle of the chapel.
MEGHAN Markle is the American television actress and star of Suits who married Prince Harry.
Meghan was walked down the aisle at Windsor Castle on May 19 by her new father-in-law, Prince Charles - here's is her story and how she fell in love with her very own Prince Charming...
Shortly after their engagement, it was announced the wedding would take place in the spring of 2018.
The American actress has been given the title Duchess of Sussex by the Queen after her marriage to Harry. The official announcement proclaimed: "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 aand Baron Kilkeel.
The highly-anticipated wedding between Prince Harry and Meghan Markle took place on May 19, 2018.
The couple tied the knot at St George's Chapel, Windsor Castle, which is where Harry was christened when he was three months old.