Now the public eagerly awaits to find out the royal baby's name.
According to TMZ, a large betting company based in the United Kingdom called Ladbrokes has been taking bets on who might be the baby's godparents, with William's brother, Prince Harry, and Pippa coming in tied for second with 10/1 odds.More news: Paris Jackson slams family members
The socialite and author included her big sister's children in her bridal party when she Wednesday hedge fund manager James Matthews, 42, in May 2017.
William's brother Prince Harry and fiancée Meghan Markle have also met the new arrival behind closed doors, while his other set of grandparents will be integral over the coming months.
George and Charlotte (far right) were page boy and flower girl for aunty Pippa Middleton (left). Naturally, big sister Kate and parents, Carole and Michael, were the first people she told - James aside - and they could not have been more delighted. The name will be announced in due course, the palace said.More news: IPL 2018 | MI vs SRH, match 23: Stats review
It shouldn't come as much of a surprise that Pippa is set to welcome her first child less than a year after her wedding.
"James was a 10-1 shot when I woke up this morning, it's been slashed to 3-1".More news: Christina Aguilera and Melissa McCarthy team up for 'Carpool Kar