The younger sister of the Duchess of Cambridge already has a two-year-old son named Arthur.
Pippa’s second baby will be a first cousin of Prince George, seven, Princess Charlotte, five, and Prince Louis, two.
A source close to the Middleton family told Page Six: “Pippa and James are thrilled, it’s fantastic news amid a difficult year.
“The entire family is delighted.”
This is a breaking news story… More to follow…