Prince Harry and Meghan Markle have arrived in the UK ahead of the long weekend of celebrations for the Queen's Platinum Jubilee.
They are joined by their children, three-year-old Archie and Lilibet, who turns one on Saturday, the Mirror understands.
It's the first time the couple's daughter, who is named after the Monarch, has visited her dad's homeland and the trip will be the first time she meets her royal family.
Earlier this month, a spokesperson for the couple said they were "excited" and "honoured" to attend the celebrations.
It is the first time the Sussexes have returned to the UK as a family since leaving for the US - although the couple made a secret visit to the Queen last month as they travelled to the Invictus Games in the Netherlands.
While they are here, it will be Lilibet's first birthday - and so far, she is yet to meet the Queen, her grandfather Prince Charles or other members of the Royal Family.
The Jubilee celebrations kick off tomorrow with Trooping the Colour - but so far, it is unknown what role, if any, Harry and Meghan will play at this event.
However, it has been confirmed they will not be appearing on the Buckingham Palace balcony after the parade for the traditional RAF flypast as the Queen has limited balcony appearances to working royals only.
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Joining the Queen on the balcony for Trooping will be Prince Charles, Camilla, the Duchess of Cornwall, the Duke and Duchess of Cambridge, the Earl and Countess of Wessex, the Princess Royal, the Duke and Duchess of Gloucester, the Duke of Kent, Princess Alexandra, and Vice Admiral Sir Tim Laurence.
Also set to appear for the historic occasion will be Prince George, Princess Charlotte and Prince Louis and the Wessexes’ children Lady Louise Windsor and James, Viscount Severn.
However, on Friday, Harry and Meghan are expected to join the Queen and the rest of the Royal Family at a service at St Paul's Cathedral.
According to the Telegraph, as well as Harry and Meghan being expected to attend the service at St Paul's, Prince Andrew is also expected to be among those attending.
This means that all of the Queen's children and grandchildren could be at the event - and some of her great-grandchildren may also reportedly attend.
Among the youngest royals that could be there are Prince George, Princess Charlotte and Mia Tindall although Harry and Meghan's two children Archie and Lilibet are unlikely to be there, given their young ages.
Meanwhile, reports have also suggested that on the Saturday, the couple will finally formally introduce Lilibet to the Queen on her first birthday at a possible party.
On Saturday, it is the Epsom Derby - an event that the Queen often attends, but it has been reported she may no longer be planning on going.
The 96-year-old monarch, who has been suffering mobility problems, is said to want to pace herself during her milestone celebrations, with her daughter Princess Anne representing her at the racecourse instead, The Sunday Times reported.
Buckingham Palace declined to comment, saying the Queen’s attendance at events would not be confirmed until closer to the time.
However, the Sun has reported that instead, Her Majesty will see her great-granddaughter, whose name honours the monarch.
They may also attend the Jubilee Pageant, which is taking place on Sunday - although again this has not been confirmed.
