Pippa Middleton.Photo: Chris Jackson - WPA Pool/Getty

LONDON, ENGLAND - JUNE 04: Pippa Middleton during the Platinum Party at the Palace in front of Buckingham Palace on June 04, 2022 in London, England. The Platinum Jubilee of Elizabeth II is being celebrated from June 2 to June 5, 2022, in the UK and Commonwealth to mark the 70th anniversary of the accession of Queen Elizabeth II on 6 February 1952. (Photo by Chris Jackson - WPA Pool/Getty Images)

Pippa Middletonis pregnant.

The younger sister ofKate Middletonis expecting her third child with her husband James Matthews, multiple sources confirm to PEOPLE. The couple is parents to son Arthur, 3, and daughter Grace, 1.

A representative for Pippa declined PEOPLE’s request for comment.

Pippa Middleton, James Matthews, James Middleton and Alizée Thévenet.Chris Jackson - WPA Pool/Getty

LONDON, ENGLAND - JUNE 04: Pippa Middleton (L) and James Middleton (R) during the Platinum Party at the Palace in front of Buckingham Palace on June 04, 2022 in London, England. The Platinum Jubilee of Elizabeth II is being celebrated from June 2 to June 5, 2022, in the UK and Commonwealth to mark the 70th anniversary of the accession of Queen Elizabeth II on 6 February 1952. (Photo by Chris Jackson - WPA Pool/Getty Images)

PIppa Middleton.Chris Jackson - WPA Pool/Getty

LONDON, ENGLAND - JUNE 04: Pippa Middleton during the Platinum Party at the Palace in front of Buckingham Palace on June 04, 2022 in London, England. The Platinum Jubilee of Elizabeth II is being celebrated from June 2 to June 5, 2022, in the UK and Commonwealth to mark the 70th anniversary of the accession of Queen Elizabeth II on 6 February 1952. (Photo by Chris Jackson - WPA Pool/Getty Images)

Pippa and James tied the knot in May 2017 at St. Mark’s Church in Englefield. Her royal nephew and niece, George and Charlotte, served in the bridal party.

Pippa Middleton and James Matthews in January 2022.Ricky Vigil M/GC Images

Pippa Middleton and James Matthews

Asource previously told PEOPLEthat Pippa and her husband have been looking forward to settling down and “having children and leading a quiet life.”

“When I learned the happy news that I was pregnant, I realized I needed to adjust my four to five-day-a-week [fitness] routine,” she wrote, noting that she kept her pregnancy a secret from her gym instructor until the “riskier months” were over.

Kate Middleton And Pippa Matthews.Karwai Tang/Getty

Kate Middleton And Pippa Middleton

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She also shared how fitness has been an integral part of her pregnancy.

source: people.com