This is the title that Meghan and Harry will be given when they marry

When Meghan Markle and Prince Harry say 'I do,' on Saturday - she will officially become a member of the British Royal Family.

And they both will be bestowed with a fancy-pants title by Harry's granny, The Queen. Now a leading genealogist has called the exact Dukedom that's coming their way... citing Sussex as the obvious choice. Yes... Step forward the Duke and Duchess of Sussex.

In conversation with Mail Online, Charles Kidd said: "They're quite limited in the titles that are available. The Duke of Sussex is the front-runner without any doubt."

Tradition dictates that royal men receive a title on the morning of their wedding; back in 2011 Prince William became the Duke of Cambridge and Kate Middleton the Duchess of Cambridge when they said 'I do,' at Westminster Abbey.

'I think the others are highly unlikely," Charles Kidd added. "Clarence hasn't been used for a long time and it's been sort of tainted by bad luck."

He went on to highlight that the dukedoms of Cumberland and Albany are actually currently suspended (good to know). The exact options available are:

• Connaught
• Albany
• Cumberland
• Ross
• Kintyre
• Kendal
• Sussex
• Clarence

We'll have to wait until Saturday for official confirmation, of course, but our money's firmly on Sussex. FYI - Sussex dates back to 1801. It hasn't been used since 1841 when Prince Augustus Frederick, the sixth son of King George III and a favourite uncle of Queen Victoria, died. Meanwhile, on Sunday it was revealed that The Queen has furthermore signed the Instrument of Consent - a hand-written document which records the fact that she is allowing her grandson and Meghan to marry (nice of her, like). A post on the Kensington Palace Insta account shows the document, which looks all sorts of fancy.