The wonderful news comes just one day after Meghan and Harry announced they are expecting their first child.
Like her sister, Pippa hasn't disclosed the sex of the baby.
Pippa was last spotted in public at the royal wedding of Princess Eugenie to Jack Brooksbank on Friday 12th October with a blossoming baby bump.
A standard room at the Lindo Wing costs nearly $11,000 with deluxe rooms starting at $11,500. Was it more than Prince George?
Adobe Premiere Rush video editor rolls out, Android to follow
The Verge was granted a week of hands-on time with Photoshop for iPad, and has a great video that demonstrates the app in action. Photoshop CC on iPad, though, is using the same code as the desktop version, and will save projects in the same.psd file format.
Prince Louis, born in April 2018, weighed more than George or Charlotte at 8lb 7oz.
What will the baby be called?
Pippa Middleton and James Matthews welcome their first child.
No announcement has been made yet about the name of Pippa's baby, but the bookies' favourite is Michael.
"Kate and Pippa have had so much fun shopping online for baby clothes and accessories!" the insider added. They married in May 2016.
Matthews had another brother, Michael, who died at the age of 22 while descending Everest, at the time becoming the youngest Brit to scale the mountain.