Boris and Carrie Johnson's wedding bash will be held at the grand estate of a major Conservative donor.
The Prime Minister and his wife hosted family and friends at the 18th-century Daylesford House to celebrate their wedding, which was scaled back last year due to the swine flu.
Stanley Johnson pulled into the estate in a car on Saturday.
Steve Bray, an anti-Brexit protester, pitched up on a road near the wedding venue with a giant banner reading "corrupt Tories"
Everyone will be watching the guest list for the event to see if anyone from Mr Johnson's Government gets an invite.
As they are campaigning to replace the Prime Minister, the former chancellor and Foreign Secretary are likely to miss the party.
Ms Truss defended Mr Johnson's extravagant celebrations at a time when millions of people are struggling to make ends meet.
When asked if the Prime Minister should focus on the crises facing the country instead of partying, she said, "I think he's entitled to enjoy his wedding day, and I wish the best to him and Carrie."
There is an event being held in a marquee on the grounds of Daylesford House.
The mansion is owned by Lord Bamford, a Conservative who has donated millions to the party.
The staff went in and out of the tent this week.
Guests will be able to relax on hay bales and benches placed outside of the marquee and eat and drink at small tables and casks as they enjoy views of the vast meadow and orchards.
The Johnsons had planned to have their wedding party at the Prime Minister's official country residence.
It was thought that Mr Johnson wanted to stay on as prime minister in order to see this through.
They decided to change location after sending out save-the-date cards for the event.
In front of a small group of family and friends, a couple were married in a low-key ceremony at a cathedral.
There was a reception in the gardens of 10 Downing Street with a limited number of people.
After the restrictions had been relaxed, Mr and Mrs Johnson were going to have a bigger celebration.
Some of the cost of the party is being covered by a billionaire, according to a report.
Mr Johnson, who has been married twice before, has received support from the chairman before.
The peer supported the leadership bid of Mr Johnson, who knocked down a wall with a digger in a stunt to show he could get a deal.
A chain of shops selling produce from the Daylesford Organic Farm can be found throughout London.
According to reports, Mr Johnson received food from the Daylesford farm shop worth an estimated $12,500 and paid for it himself.
No 10 wouldn't comment on the wedding celebrations.