Pippa Middleton will later today marry her fiancé James Matthews in a private ceremony at St Mark's Church in Englefield, Berkshire.

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Pippa hit headlines with a figure-hugging outfit at her sister Kate's wedding to Prince William but now the world-famous bridesmaid is becoming a bride herself.

Once again, all eyes will be on her dress as the 33-year-old marries financier James on Saturday at a lavish society wedding where Prince George and Princess Charlotte will play starring roles.

Pippa will become a bride herself later today. Photo: PA

The wedding party is yet to be revealed and it's unclear whether the Duchess of Cambridge will stand as a bridesmaid for her sister.

It's understood preparations have been going well, with immediate family taking part in a full dress rehearsal earlier this morning.

The venue went into complete lock down with a number of police around the area with sniffer dogs in tow.

It's unclear whether the Duchess of Cambridge will have a role in the wedding. Photo: AAP

Trucks and vans have been delivering to Pippa's parent's house all day, which is where the reception is said to be held, and workman have been ensuring the area is clean and well groomed.

It's understood Pippa has banned all wedding guests from uploading any photos to social media.

Vans and trucks have been coming and going from the family estate all day. Photo: AAP

Prince Harry is expected to attend both the ceremony and the reception with his girlfriend, Meghan Markle, likely to attend just the reception.

Three-year-old Prince George, who is third in line to the throne after his father William and his grandfather Prince Charles, will be a page boy at the ceremony while his two-year-old sister Princess Charlotte will be a bridesmaid.

The wedding is taking place in the Berkshire countryside west of London, near the Middleton family home.

Pippa and James got engaged in the middle of last year. Photo: AAP

It will reportedly feature a flypast by a World War II-era Spitfire plane, temporary glass marquee and luxury portable bathrooms with oak fittings.

Pippa Middleton rocketed into the public eye at her sister's wedding in 2011, which had an estimated worldwide television audience of two billion.

Pictures of her wearing her white Alexander McQueen maid of honour's dress filled newspapers for weeks afterwards.

Pippa's role in her sister's royal wedding garnered world-wide attention. Photo: AAP

"It is a bit startling to achieve global recognition (if that's the right word) before the age of 30 on account of your sister, your brother-in-law and your bottom," she once wrote.

Who are Pippa Middleton and James Matthews?

Pippa is the second of the three Middleton children, a year younger than Kate and four years older than businessman brother James.

She spent her early years in Amman where father Michael Middleton worked with British Airways, before attending a series of top private schools on the family's return to Britain.

She graduated from Edinburgh University with an English literature degree, then became a socialite on London's posh party circuit.

Pippa and James will tie the knot later today. Photo: AAP

When her sister married, Middleton had the prime supporting role, appearing on the Buckingham Palace balcony with the royals.

She worked part-time for her parents' party business then published a wholesome book on party planning in 2012.

A regular royal box guest at the Wimbledon tennis championships, Middleton remained visible on the social circuit.

She had relationships with former England cricketer Alex Loudon and stockbroker Nico Jackson before falling for 41-year-old James.

The former professional racing driver is the heir to the Scottish title of Laird of Glen Affric.

They got engaged on July 17 last year.

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