Photos from Duke and Duchess of Sussex, Prince Harry and Meghan Markle’s Wedding Ceremony

Huge crowds have gathered in Windsor, with hundreds of die-hard royalists – many decked out in the national colours of both Britain and the United States – camping out overnight to secure the best views.

It is expected to be the biggest royal wedding in Britain since Prince William married Kate in 2011 with more than 21million UK households set to watch and 23million expected to tune in from America.

The Queen has conferred the titles on her grandson and his bride-to-be as they prepare to walk down the aisle at St George’s Chapel, Windsor today.

The royal groom was given a dukedom – the highest rank in the British peerage – to mark his marriage to Meghan Markle.

American former actress Meghan will now become Her Royal Highness the Duchess of Sussex on her marriage at the much-anticipated ceremony in St George’s Chapel, Windsor Castle.

Harry also received Scottish and Northern Irish titles, becoming the Earl of of Dumbarton and Baron Kilkeel, which means Meghan will become the Countess of Dumbarton and Baroness Kilkeel.

All titles are in the gift of the Queen and it was up to the monarch to choose which one to bestow on her grandson and his new wife.

As Ms Markle approached the altar, Prince Harry mouthed the words: “You look amazing.”

She arrived accompanied by two page boys who held up her train as she made her way up the chapel’s steps alone.

She was wearing a simple, long-sleeved white dress, with veil covering her face.

As Ms Markle entered the chapel, a fanfare was played. The bride, having been greeted by the Dean of Windsor, then moved in procession through the Nave where she was joined by the Prince of Wales – in place of her father, Thomas Markle, to the High Altar. The bridegroom and his best man await.

Her dress is by Clare Waight Keller for Givenchy.