It comes after Prince Andrew rejected calls from within Buckingham Palace for a more modest wedding for Eugenie and Jack amid concerns about the public cost. 
Eugenie and Jack's wedding last Friday was a lavish and star-studded affair, with celebrities from Robbie Williams to Demi Moore and Naomi Campbell to Pixie Geldof.
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Eugenie's father the Duke of York wished Sarah a 'very happy day' on her birthday today
Eugenie's father the Duke of York wished Sarah a 'very happy day' on her birthday today
Prince Andrew also retweeted one of Sarah's tweets today featuring Eugenie and Jack
Harry and Meghan were wed at the same chapel in another impressive wedding in May, and their news emerged as their first tour outside the UK and Ireland begins.
The couple arrived in Sydney today ahead of their hotly-anticipated 16-day tour which will take in Australia, New Zealand, Fiji and Tonga. 
Eugenie's star-studded two-day event garnered huge media attention, but many have questioned whether the minor royal's occasion warranted such extravagance. 
It is thought royal aides were concerned about public reaction to the extravagant celebrations, which cost the taxpayer £2million, and suggested toning it down.

The Duke and Duchess of Sussex speak with the Queen at Windsor Castle last Friday
Prince Andrew says daughter Eugenie and Jack are 'so in love'
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But it was revealed yesterday that Prince Andrew rejected calls from within Buckingham Palace for a more modest wedding for Eugenie and Jack.
Palace sources said it was the Duke of York who insisted his daughter take a carriage ride through Windsor, mimicking Harry and Meghan earlier this year.
Speaking ahead of Eugenie's wedding last Friday, her father Prince Andrew, Duke of York, talked about how it would be very different to Harry and Meghan's big day.
He told ITV's This Morning: 'It will not be the same as the previous one that was held in May. It's not a public wedding, this is meant to be a family wedding.The Duke and Duchess of Sussex speak with the Queen at Windsor Castle last Friday
'Let's kiss' Moment Princess Eugenie seals royal wedding
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Meghan and Harry leave St George's Chapel at Windsor Castle after their wedding in May
Meghan talks to Princess Anne at Eugenie and Jack's wedding at St George's Chapel last Friday
Meghan talks to Princess Anne at Eugenie and Jack's wedding at St George's Chapel last Friday
'There will be a few more people than most people have. There are a few more than Harry had but that's just the nature of Eugenie and Jack.
'They've got so many friends and they need a church of that size to fit them all in.'
Minor royal weddings in the past have been short and held in private - a stark contrast to celebrations over the weekend.
Among them was when Princess Margaret's daughter Lady Sarah Armstrong-Jones, the Queen's niece, tied the knot to Daniel Chatto in 1994.The Duchess of Cambridge talks to Harry and Meghan at the wedding in Windsor last week
Zara tells Prince Harry 'It's quiet compared to your wedding'
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The Duchess of Cambridge talks to Harry and Meghan at the wedding in Windsor last weekThe Duke and Duchess of Sussex at the wedding  at St George's Chapel in Windsor last Friday
The Duke and Duchess of Sussex at the wedding at St George's Chapel in Windsor last Friday
Their service at St Stephen Walbrook Church in the City of London lasted just 30 minutes and 200 guests were invited. But Eugenie handed out 1,400 invitations.
The Queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall and Duke and Duchess of Cambridge are said to be 'delighted' for Harry and Meghan. 
Doria Ragland, the mother of the duchess, is 'very happy about this lovely news' and 'looks forward to welcoming her first grandchild'. 
A Kensington Palace spokesman said: 'Their Royal Highnesses The Duke and Duchess of Sussex are very pleased to announce that The Duchess of Sussex is expecting a baby in the Spring of 2019.Princess Eugenie and Jack Brooksbank kiss on the steps of St George's Chapel last Friday
Meghan and Harry leave St George's Chapel at Windsor Castle after their wedding in May
Highlights from Princess Eugenie and Jack Brooksbank's wedding
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'Their Royal Highnesses have appreciated all of the support they have received from people around the world since their wedding in May and are delighted to be able to share this happy news with the public.' 
Last Friday, Eugenie shared two shy kisses on the West Steps of St George's Chapel with her new husband Jack after their lavish royal wedding ceremony. 
The couple tentatively performed the kisses for the cameras on the steps, which were decorated with masses of autumn flowers and lined with Grenadier Guards.
After their afternoon reception in Windsor Castle, Jack drove Eugenie away in a silver DB10 Aston Martin sports car. The wedding drew in a peak of 3.9million on ITV.

When is the royal baby due, how old is Meghan and when did she marry Harry? Your questions answered

Fans of the royal family have been eager to discover as much detail as possible about the upcoming newest addition to the Windsor family after the Duke and Duchess of Sussex announced they are expecting a baby.
The news spread around the world and Google has revealed that, after the UK, Australia and New Zealand are the countries asking the most questions about the royal baby, with Ireland and Poland seeing out the top five.
The web giant also compiled the most-asked questions typed into their search engine since the announcement was made on Monday morning.
When is the baby due? Will he or she have a title? And how will the child fit into the line of succession? Here are the answers everyone is looking for.
1. When is royal baby due?
The Kensington Palace Twitter account broke the news by saying Meghan “is expecting a baby in the Spring of 2019”. For those looking for a more precise time, she is believed to have already had her 12-week scan so those close to the couple are expecting the birth some time in April.
2. How old is Meghan Markle?
Meghan is 37 years old, three years older than her husband Harry.
3. When did Harry and Meghan get married?
Prince Harry and Meghan Markle wed on May 19 this year. On the same day they were given the titles Duke and Duchess of Sussex.
The event was hailed as a joyous combination of tradition and modernity, bringing a gospel choir and rousing address from American preacher Bishop Michael Curry to the gothic surrounds of the 15th Century St George’s Chapel at Windsor Castle.
4. Which royal is having a baby?
#RoyalBaby has been trending on social media for much of Monday morning, but not everyone would have seen the original announcement.
So to do away with any doubt, the only royal who we know for sure to be expecting a baby is Meghan, Duchess of Sussex.
Whether there are any other royal buns in the oven is currently not public knowledge.
5. What months are spring?
Spring falls on the months when weather changes from a frosty, barren winter to a verdant and sunny summer, commonly thought to be from March to May in the UK.
6. What title will the new royal baby have?
If the new baby is a boy he will likely take one of Harry’s lesser titles, such as Earl of Dumbarton or Baron Kilkeel, which he was given on his wedding day.
If the happy couple have a daughter she will be known as Lady Mountbatten-Windsor.
7. When does spring start?
The Met Office, which studies and reports on the UK’s weather, says there are two methods of understanding the months in which the seasons fall.
Meteorological seasons are based on how the temperature changes throughout the year, whereas astronomical seasons refer to the Earth’s movement around the sun.
Because of these differences the exact dates change slightly each year. In 2018 the meteorological spring began on March 1 and and ended on May 31 and the astrological spring started on March 20 and ended on June 21.
The dates are likely to be the same, or at least very close, for 2019.
8. Who is Prince Harry’s father?
Prince Harry’s father is Prince Charles, eldest child of Queen Elizabeth II and heir apparent to the British throne. His mother was Diana, Princess of Wales, who died in a car accident in Paris in 1997 when Harry was just 12 years old.
9. Who’s next in line for the throne?
Prince Charles, Harry’s father, is next in line for the throne, followed by Harry’s older brother Prince William.
William’s children, George, Charlotte and Louis, follow their father in the line of succession before Harry and then his new child, who will be seventh in line.
The news of Meghan’s pregnancy pushes Prince Andrew, Charles’s younger brother, into eighth in line, followed by his eldest daughter Beatrice and younger daughter Eugenie, who was married at St George’s Chapel on Saturday.
10. Will the new royal baby be a prince or princess?
The new baby will be neither a prince nor a princess because King George V limited titles in the Royal Family in 1917.
The Queen made an amendment in late-2012 to declare that all of William and Kate’s children will be called Prince or Princess, but the same does not apply to Harry and Meghan’s offspring.