While there's no doubt Prince Harry and Meghan Markle are a thoroughly modern-day couple, Kensington Palace has promised their May 19 wedding will be "guided by tradition allowing everyone to celebrate what makes Royal weddings so special".
Here's a look at some of the royals time honoured traditions that could pop up on the day.
A SPRIG OF MYRTLE
A sprig of myrtle has been in the bouquet of every royal bride since Queen Victoria's daughter Princess Victoria married Prince Frederick of Prussia in 1858.
Since then the plant has shown up in the bridal bouquets of the Queen, Diana, Princess of Wales and the Duchess of Cambridge - and it is expected Markle will follow suit.
The sprig of myrtle has traditionally come from a bush, planted by Queen Victoria at Osborne House on the Isle of Wright. The myrtle was given to her in a posy by her husband Prince Albert's grandmother.
A WELSH WEDDING BAND
A tradition started by the Queen Mother when she married the future King George VI in 1923 was for royal wedding bands to be made from Welsh gold.
The Queen, Princess Margaret, Princess Anne and Diana, Princess of Wales were all given rings made from the same nugget of Welsh gold on their wedding days. The Duchess of Cambridge's wedding ring was fashioned from a nugget of Welsh gold given to Prince William by the Queen.
A MILITARY OUTFIT
As per tradition for royal grooms Harry is expected to don his military uniform when he says 'I do', following in the steps of his grandfather, father, uncle and brother.
Having served a decade in the Army and now sitting as the head of various branches of the armed forces he'll have a variety of uniforms to choose from on his big day.
A WEDDING CAKE
While fruit cake has been a staple at royal weddings past, Prince William broke ranks and also requested a chocolate biscuit cake that was a childhood favourite.
Harry and Markle have gone a step further, dispensing with the fruitcake tradition and requesting Californian pastry chef Claire Ptak make a lemon and elderflower cake iced with buttercream for their nuptials.
A BALCONY KISS
A much-loved tradition begun by Prince Charles and Diana at their 1981 wedding the kiss on the balcony of Buckingham Palace is a firm crowd favourite royal wedding tradition.
The Duke and Duchess of Cambridge obliged well-wishers gathered outside the palace after their wedding with a kiss, to a roar of approval from the crowd.
With Harry and Markle choosing to marry at St George's Chapel in Windsor there will sadly be no balcony kiss to look forward to after their wedding, though royal watchers will be eagerly watching to see if the pair decide to share a smooch in front of crowds at a different location.
A FUTURE TITLE
Most women who marry royal male successors take on their husband's titles, in the same way Lady Diana Spencer became Diana, Princess of Wales upon marrying the Prince of Wales.
Prince Charles' second wife, Camilla Parker Bowles, however, adopted the title Duchess of Cornwall out of respect for Diana.
Prince Harry is expected to receive a peerage from the Queen, just as Prince William received the hereditary title Duke of Cambridge, with his wife Catherine becoming the Duchess of Cambridge.
The newlyweds are tipped to become the Duke and Duchess of Sussex a title which has only been used once before by Prince Augustus in the early 1800s. Other dukedom titles currently not in use are Clarence and Buckingham. However Clarence is considered unlikely because the previous Duke of Clarence, Queen Victoria's grandson Prince Albert Victor, was a suspect in the Jack the Ripper murders.
LOCATION, LOCATION, LOCATION
St George's Chapel at Windsor Castle, which has been a popular spot for royals to tie the knot over the years and is all set to host Harry and Markle's nuptials on May 19.
Historically, the most traditional site for royal weddings has been the Chapel Royal at St James Palace, where five monarchs including Queen Victoria tied the knot.
London's Westminster Abbey is also a favourite hosting five royal weddings since 1919, including the Queen's and Prince William's.
RELIGION AND ROYALTY
Markle was baptised by the Archbishop of Canterbury into the Church of England prior to her marriage to Harry who, thanks to his royal lineage, is firmly ensconced in the faith.
Mystery surrounds Markle's religious background, she attended the Immaculate Heart High School, a private Catholic School for girls in Los Angeles, but reportedly wasn't raised a Catholic.
Under the Act of Settlement 1701, royals in the direct line of succession were banned from marrying Catholics unless they gave up their right to the throne. Changes introduced in 2015 overturned that rule.
PERMISSION TO MARRY
Unlike most couples who want to marry, things are trickier when you're a royal. Harry and Markle needed official permission from his granny, the Queen, who reportedly obliged after having tea with the couple in October.
The Royal Marriages Act 1772 originally required all royal descendants of George II to obtain the monarch's permission to marry, but the law was amended in 2011 so only the first six royals in line to the throne need permission.
Harry and Meghan will also require a special wedding licence from the Archbishop of Canterbury if they want to marry in a church because of her divorce from American film and TV producer Trevor Engelson. And as a foreign national, Markle will need a fiancee settlement visa and a marriage visa.