Pippa Middleton is reportedly set to wed next year.

Pippa Middleton

Pippa Middleton

The Duchess of Cambridge's younger sister has finally put in place marital plans with her 41-year-old fiancé, and is set to tie the knot on May 20, 2017 at the Saint Mark's Englefield in Berkshire, Surrey, according to US Weekly.

It has been reported the couple and their guests will travel seven miles to the 33 year old's parents' home in Bucklebury to enjoy the wedding reception, which will be held in a luxury marquee in the garden.

And Pippa's niece Prince Charlotte - who is the youngest child of Prince William and Catherine - will be one of the flower girls on their special day.

The source said: "Princess Charlotte is going to be one of the flower girls."

And so not to be left out Prince George is in talks to be his auntie's page boy.

The source continued: "They're planning for Prince George to be a page boy."

However, the insider has claimed Catherine - who is also known as Kate Middleton - will not be a bridesmaid or Maid of honour to her sibling, although it is rumoured she may do a reading.

Although there is growing speculation fashion designer Giles Deacon will create her marital gown, it has yet to be confirmed, as Pippa wants to "explore her options" and has an entire folder filled with ideas and magazine cut outs to help her decide.

A separate source said: "Very chic, very classic. Think antique, ivory, and a twist like adding lace. She hasn't picked the final look, but it was important to explore her options before going for bridal gown fittings. She took lots of photos on her phone and was really excited. She has a folder of magazine cuttings and pictures she has taken."

And the star has even dwelled over her flower arrangements.

Another insider added: "She was inside looking at bridal bouquet mock-ups for an hour."