Kate Middleton's sister is going to be a mother of two!
Pippa, 37, and James, 45, wed in 2017 and are already parents to 2-year-old son Arthur, who was born on Oct. 15, 2018.
"Starting my son Arthur swimming at four months old has given him confidence and enjoyment in water," Pippa shared. "He's now six months old, and swimming is one of our favorite activities. The exercise helps guarantee sound daytime sleeps, and the movement has improved his digestion."
"Water activity is a great form of exercise you can do with your baby!" she added.
As for Pippa's niece and nephews, Princess Charlotte, Prince George and Prince Louis, they recently made their first red carpet appearance.
For more adorable moments with Kate and Prince William's kids, watch the video below.