Her parents and siblings may well be staying in their hometown of Bucklebury tonight as they prepare for the society wedding of the year tomorrow, but the Duchess of Cambridge was spotted driving through London on Friday afternoon.
It is thought that Kate attended the rehearsals for sister Pippa's wedding at St Mark's Church before driving her Range Rover back to Kensington Palace this afternoon.
Kate's children, Prince George and Princess Charlotte, are acting as page boy and flower girl at the nuptials tomorrow, so the mother-of-two most likely had plenty to organise back in the city.
It is unclear whether her husband, Prince William, or children were with her in the vehicle but the family-of-four will make an appearance together in Berkshire tomorrow.
Also spotted making last minute preparations for the wedding was Meghan Markle, Prince Harry's girlfriend, who was seen outside a Soho spa after flying into London to join her royal beau at St Mark's tomorrow.
Casually dressed in leggings, a hoodie, a baseball cap and shades - albeit with the addition of an expensive Mulberry handbag - the Suits star lingered outside the venue as she waited for a driver, likely to whisk her back to Harry's Kensington Palace apartment.
Last minute preparations were also underway at the Middleton estate in Berkshire, where a 140ft glass marquee has been installed for the reception following the ceremony.
Exterior shots of Pippa's 'crystal palace' on Friday revealed glimpses of spectacular cherry blossom trees inside.
With less than 24 hours to go before Pippa and James say 'I do' in the society wedding of the year, their families descended on St Mark's church for a wedding rehearsal on Friday afternoon.
The bride's parents, Carole and Michael, were joined by their son James at St Mark's.
The Middletons were flanked by the Matthews clan - including best man and Made In Chelsea lothario Spencer - at the venue.
Prince George and Princess Charlotte's Spanish nanny, Maria Borrallo, was also seen arriving as the wedding party sheltered under umbrellas when the heavens opened - weather that is forecast to last all weekend. Prince George will act as page boy and Charlotte as a flower girl but neither the youngsters - nor their parents - appeared to be in attendance at the run-through.
Spencer, who is James's younger brother, showed off his dapper new look after visiting a swanky London salon on Thursday. He wore a green tweed jacket as he made his way into the church with his parents, David and Jane.
Pippa and Kate's younger brother, James, was the perfect gentleman, holding an umbrella over his mother Carole as they navigated a country lane on the Englefield estate.
A Green Parlour florist van - the same company that Kate enlisted for the Royal Wedding in 2011 - was seen arriving at St Mark's Church on Friday ahead of Pippa and James Matthews's wedding.
Whilst it hasn't been confirmed who will be providing the blooms for Pippa's big day, Berkshire-based Green Parlour is an obvious choice considering they've been the Middleton's family florist for years.
Run by Emma Sampson, Green Parlour apparently supplied the Middleton family with flowers for four years prior to preparing the blooms for the Royal Wedding.
Whilst prices for wedding flowers are totally bespoke, bouquets on her website are reasonably priced between £35-£75.
Bridebook founder Hamish Shephard, who has organised many society weddings, predicts Pippa's flowers could set her back £16,000.
Hamish said: Marquees always require a lot more floristry and decoration than a venue, so luxury florists will have their work cut out. On top of this, the wedding florist will include the flowers for the church, plus the bouquet and more.
On her website, Emma writes: 'Flowers have been a huge part of my life since I was at school. Before opening Green Parlour Florist I picked up a degree in fine art, gave flowers up and began working as a manager for Gap and French Connection, but flowers were always at the back of my mind.
'In 2008 with the support of Paul and Margaret, we opened the doors to Green Parlour Florist in Reading and I’ve been lucky enough to do what I love ever since. We’ve grown employing six people who are as obsessed with flowers as us.
MailOnline has contacted Green Parlour Flowers and is awaiting a response.
Pangbourne-based Green Parlour provides flowers, plants and accessories to clients throughout the South East.
Established in 2008, Green Parlour is run by 30-something Emma Sampson and has a large number of customers, based in the South East, including leading hotels, professional firms and many households.
Having previously worked for The Flower Box in the Reading Oracle, Emma's biggest coup was being enlisted by The Duchess of Cambridge to provide the flowers for the Royal Wedding in 2011.
It's being touted as the society event of the year so it's hardly surprising that the church grounds surrounding Pippa Middleton's wedding venue went into total lockdown on Friday.
Metal barriers - thought to be in place for Pippa and James's big day tomorrow - were erected around the church as security arrived on the scene just 24 hours before the couple will say their vows at St Mark's Church in Bucklebury, Berkshire.
The last-minute preparations come after workmen appeared to be making some last-minute improvements to the church and gardens where Pippa and James will tie the knot.
The installation of the barriers comes after a fleet of Bentley Bentayga 4x4 were delivered to Englefield House earlier this week, which could well be the cars that will ferry guests from the church to the Middleton family home a few miles away for the evening reception.
A gardener was seen mowing the lawns for the second time this week, whilst workers were spotted cleaning and fixing the church's sign - preparations that are thought to be taking place ahead of the society wedding of the year.
With just days to go until their big day, Pippa Middleton and her fiance James Matthews have been spotted out and about making some final preparations.
Pippa Middleton was seen driving through the rain with her mother Carole this week near to St Mark's Church in Bucklebury, Berkshire, where the wedding will take place on Saturday.
The Mail today revealed that the wedding with have a Scottish theme. Pippa’s links to God’s Country are a little unclear – although she did go to Edinburgh University.
Groom James Matthews, however, is better connected and it would seem this has driven the plan for the nuptials.
James’s father, David, a former mechanic who made a fortune through the car trade, owns a castle and 10,000-acre estate 15 miles from Loch Ness in the Highlands.
His acquisition of the property in 2008 also bought him the courtesy title of the Laird of Glen Affric, which will be inherited by his eldest son, hedge fund boss James. That would make Pippa Lady Glen Affric one day.
Friends say Pippa and her fiance have a deep love of Scotland and often spend time at the Matthews family estate, where they hold annual shooting parties at the Glen Affric Lodge.
As a result the 300 guests at the wedding are set to enjoy a wealth of food sourced from the region around Glen Affric, including haggis canapés and lamb, all washed down with local whisky.
Some people might not be happy to find the peace and quiet of their village disturbed by an influx of the world's media.
But some enterprising mothers in Englefield have turned the spotlight on the area into an opportunity by selling leftover tea and biscuits from their PTA meeting to visiting reporters.
They managed to make a respectable £25 for the Englefield primary school's PTA.
Several mothers even ended up being interviewed by reporters from NBC.
Guests arriving for the evening do are being told to congregate at the village hall, where they will be security checked before being taken up to the main house in a luxury car, one source revealed.
Asked for details about the fleet of cars being supplied to the wedding, Jaguar Land Rover declined to comment.
Yesterday, several dozen vans and lorries arrived at the Middleton family home, as well as the nearby village of Englefield, where the ceremony will take place. Among them was a van from Jones Hire, a premier catering rental company, providing tableware, furniture and kitchen equipment for ‘prestigious’ events.
It is understood that a firm which has worked with Prince Harry, Boultbee Flight Academy, will be organising Pippa’s vintage aircraft fly-past, which will feature two Spitfires, and is estimated to be costing around £20,000.
The prospects for a sunny wedding are not looking good for the couple, however, with heavy rain predicted for the weekend by the Met Office.
The multi-millionaire hedge fund boss, 41, was seen carrying a rucksack and two high-end black shopping bags from the exclusive shoe-maker Edward Green, where formal shoes start from £900.
It was earlier revealed that Pippa Middleton has certainly made sure the toilets for her nuptials will match the extravagance of the venue.
Bespoke ‘throne rooms’ are being provided for guests, designed to resemble a permanent fitted luxury bathroom.
They boast oak fittings, porcelain basins, spot lighting and full-length mirrors, while the toilets are fitted with vacuum flushes, which work like those on a plane and are eco-friendly.
With just hours to go before the big day, the posh portable toilets were delivered by lorry to the Middletons’ £5 million family home in Bucklebury, Berkshire yesterday.
One industry insider estimated the cost of the loos could easily top £6,000.
The firm that provides them, AndyLoos, describes itself as the ‘foremost provider of luxury portable toilets’.
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The Daily Mail yesterday revealed Miss Middleton, 33, and her millionaire fiancé, hedge fund boss James Matthews, 41, have hired a huge glass marquee, shipped from Belgium and set up in the Middletons’ garden, to host their wedding breakfast and evening festivities.
Preparations for the nuptials, which will be attended by the Duke and Duchess of Cambridge and Prince Harry, were in full swing yesterday.
A van delivering beer from the Ramsbury Brewery in Wiltshire also arrived at the house, as well as some electricity generators.
Meanwhile in London several garment bags – possibly containing bridesmaids’ outfits or even Miss Middleton’s hotly anticipated wedding dress – arrived at the £17 million mansion she shares with Mr Matthews.
The Duchess of Cambridge’s personal hairdresser, Amanda Cook Tucker, was also seen wheeling a suitcase into the house, implying Kate has recommended her to her sister.
After attending a final dress fitting last week, it appears that the 33-year-old's wedding dress was safely hand delivered to her Chelsea home on Tuesday morning.
The bag, which was zipped up to conceal the contents from any prying eyes, appeared to be rather slim-fitting and simple in style and free from fussy layers and tulle.
It has also been reported that she has instructed members of the congregation to bring a second outfit for the evening reception.
According to Daily Mail diarist Richard Eden, the Duchess of Cambridge's younger sister, 33, wants her guests to have a change of clothes for the second leg of her big day on May 30.
When the Duchess of Cambridge tied the knot with Prince William in April 2011, she changed into a second wedding gown for the evening celebrations at Buckingham Palace - so Pippa may well be planning on a change of outfit herself.
Although there will be 100 or so guests at St Mark's Church in the nearby village of Englefield for the ceremony, more than 300 are expected back at Middleton manor to dance the night away.
In addition to beauty treatments, Pippa has been hitting the gym hard and has joined Grace Belgravia, an exclusive club that promises to create the perfect 'Hollywood' pins - at a cost of £55,000 for a lifetime membership.
The women-only Knightsbridge club and spa is home to the Capri Palace Leg School, which uses a method of treatment involving mud packs, bandages, hot and cold water and stone massages pioneered by Italian anti-ageing guru Professor Francesco Canonaco.
Pippa, a former party planner, has decreed that her big day should have a ‘relaxed’ country wedding feel – but is leaving nothing to chance.
Sources have told the Mail that Pippa’s father is tearing his hair out at the complexity of the arrangements. ‘But he is hugely excited by everything, particularly in giving his youngest daughter away,’ they added.
Although the Middletons maintain the wedding is a private family event, the eyes of the world will be upon it as it is being attended by the Duke and Duchess of Cambridge and Prince Harry with his girlfriend, actress Meghan Markle.
Pippa’s niece and nephew will also take a starring role – Princess Charlotte, two, will be a bridesmaid while three-year-old Prince George will be a page boy.
A controlled media facility has been arranged to capture their arrival at church, while normally accessible public footpaths in the area are being closed.
Meanwhile Pippa's sister the Duchess of Cambridge enjoyed talking about the upcoming nuptials at The Queen's first annual garden party of the season.
Around 8,000 guests attended the Buckingham Palace event looking to catch a glimpse of the royals attending, including Prince Philip, Prince William, Princess Beatrice, the Earl of Wessex, Princess Anne, the Duke of Kent and Prince and Princess Michael of Kent.
Kate chatted to Andrew Bates and his wife, Janet, about her sister's wedding at the weekend - and revealed that while she was hugely looking forward to it, she was slightly nervous about how her children, Prince George, three, and two-year-old Princess Charlotte would behave as well.
Mr Bates, 55, from Coventry said: 'She said that they were all really looking forward to her sister's wedding at the weekend but she was a bit worried about how her children might behave.