A spokesman for Prince William and Kate Middleton said they were "thrilled" for Pippa and her husband.
The exciting birth of the couple's first child comes right after Meghan Markle and Prince Harry's announcement of Markle's pregnancy.
The mom-to-be, who's keeping her baby's gender a secret, was spotted at Princess Eugenie and Jack Brooksbank's wedding on Friday, 12 October, after it was rumoured she wouldn't attend to give birth, Harper's Bazaar reports.
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Pippa Middleton, the sister of the Duchess of Cambridge, has given birth to a boy. Prince George and Princess Charlotte served in the bridal party, much like they did last week during Princess Eugenie's wedding in Windsor.
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.
Swimming has been a major outlet for fitness fanatic Pippa throughout her pregnancy, during which she had to tone down her "five-day-a-week [exercise] routine". As a result, one of the biggest changes is that my lower body has tightened up.
What will the baby be called?
Michael is the first name of Pippa and Kate's father.