Pippa Middleton is a new mom.
"Everyone is delighted and mother and baby are doing well," Pippa's rep told the magazine.
USA Today said Pippa gave birth in the Lindon Wing of St. Mary's Hospital, the same place where Kate welcomed her three children.
Kate is parent to 5-year-old Prince George, 3-year-old Princess Charlotte and 5-month-old Prince Louis with Prince William, Duke of Cambridge.
Pippa and Matthews married in May 2017 and confirmed Pippa's pregnancy in June.
Pippa gave birth amid news William's brother, Prince Harry, is expecting his first child with Meghan Markle, Duchess of Sussex.