According to reports, the latest addition to the family was born yesterday at 1.58pm, weighing a healthy 8lb 9oz.
Kensington Palace confirmed the birth of the boy in a short statement this morning from her sister Kate and brother-in-law Prince William. Still, the couple had enough time to attend Princess Eugenie's wedding before checking in to the hospital just three days later.
She has never disclosed the due date, however many media outlets predicted she would likely give birth this month.
She and her husband financier husband James Matthews are said to be "delighted".More news: Sanath Jayasuriya charged for breaching the ICC Anti-Corruption Code
Until Louis was born, George was the heaviest future king in 100 years, and while Louis has taken that title from his older brother, Pippa's son can boast that he in turn is heavier than him. And, the mum to be previously revealed in her column that she is keeping up her fitness regime throughout and is particularly enjoying swimming.
"Kate and Pippa have had so much fun shopping online for baby clothes and accessories!" the insider added. As a result, one of the biggest changes is that my lower body has tightened up.
What will Pippa's baby be called?
The 35-year-old, who Wednesday James in a gorgeous ceremony in May of 2017, is surely happy to be putting her pregnancy behind her as she prepares for life with the couple's new addition.