Once the wedding of the year is done and dusted, with the tiara and gown safely packed away, what will Prince Harry and his new wife Meghan Markle do with the rest of their lives?
Where will they live after their wedding on Saturday? Where will they honeymoon? Will they have children or focus on promoting the many charities and causes close to their hearts?
No one really knows for sure what their priorities are, but royal commentators believe that charity work is likely to be a key focus for the newlyweds.
Thirty-three-year-old Harry is associated with 20 charitable organisations focused on causes ranging from wildlife to wounded veterans, HIV and children in need, some of which are similar to those that his late mother, Diana, Princess of Wales chose to help.
And while Meghan, 36, gave up her acting career in the US to join the royal family, the former Suits star has spent years campaigning for women's rights and racial equality.
Royal commentator Richard Fitzwilliams believes the couple's activism will be on a different scale to that of other members of the royal family.
"It'll be more like Diana when she gave up 100 charities after her divorce from Prince Charles and concentrated on just six," he told AAP.
"They'll be more hands on and they'll be not only national but international, particularly in the Commonwealth.
"They will be a dynamic international duo inspired by Diana."
During the couple's televised interview after their engagement was announced last November, Meghan said she was looking forward to being able to "work as a team" with Harry.
Harry hinted that they could spend a bit of their time in Commonwealth countries, saying they had a passion "for wanting to make change, change for good".
"With lots of young people running around the Commonwealth, that's where we are going to spend most of our time hopefully," he said.
The Queen, who has long championed the Commonwealth's 53-member nations, appointed Harry as its youth ambassador in April, his highest-profile public role so far.
"I'm also incredibly grateful that the woman that I am about to marry, Meghan, will be joining me in this work, in which she too is hugely exited to take part in," Harry said.
Historian and author Dr Anna Whitelock expects Harry and Meghan to appear as a "double act while she finds her feet" as a senior member of the royal family.
"The royal family's senior courtiers are very savvy and they're very media oriented," Dr Whitelock said.
"After Diana's death they realised they need to be very public facing so I think they realise Meghan and Harry are a great brand for the royal family and they will be wanting to cash in on that in the short term."
Sydney will be one of the first places the newlyweds take their double act when they visit in October for the Invictus Games, the paralympic-style sports event Harry set up for defence veterans.
Royal courtiers are also mindful of the need to show how Harry and William pull their weight as senior royals, given the Queen is now 92 and has been in the past few years delegating many of her public duties to Prince Charles and her two grandsons.
"It's important they are seen to have substance rather than just the style and glamour and sparkle," Dr Whitelock said.
"I think in order to justify their continued existence, if you like, at the core of the royal family they will have to be seen to be very proactive in what they do."
As Meghan and Harry decide what charitable causes to focus on, there's also the practical day-to-day matters of where to live and if, and when, they will have children.
British media reports have speculated that the Queen will bequeath a stately home to the newlyweds, possibly York Cottage, which is part of her Sandringham estate.
They're also expected to be given regal titles, with the Duke and Duchess of Sussex the hot favourite.
Harry's brother Prince William and his wife Catherine were bequeathed Anmer Hall, a Georgian country house at Sandringham after their 2011 wedding and given the titles Duke and Duchess of Cambridge.
Harry and Meghan currently live in a quaint two-bedroom home, Nottingham Cottage, inside the walled surrounds of Kensington Palace in central London where William, Catherine and their three young children also reside.
However recent media speculation suggests that extensive renovation work is being carried out on a 21-room apartment next door to William's family apartment so Harry and Meghan can move in.
Meanwhile the British bookies are banking on the newlyweds honeymooning in Botswana or the Caribbean before having a baby in 2019.
During their engagement interview with the BBC, Harry laughed off a question about whether his plans included children, saying "one step at a time and hopefully we will start a family in the near future".
However Meghan may have other ideas, with her former agent revealing that the actress told her how she "can't wait" to have children while they were on a work trip to the Cayman Islands in 2016, the year she met Harry.
"She said to me, 'I would absolutely love to have children, and I can't wait to be a mother'," Gina Nelthorpe-Cowne told a Sky documentary that aired in the UK last week.