Pippa Middleton welcomed her first child with husband James Matthews.
The couple welcomed a baby boy on Monday at 1:58 p.m., local time, weighing 8 lbs. 9 oz., PEOPLE confirms.
“Everyone is delighted and mother and baby are doing well,” her representative tells PEOPLE.
The newest addition to the family makes her older sister, Kate Middleton, an aunt for the first time. The royal mom of three likely has plenty of sage advice (and newborn clothes!) to pass on to her younger sister, who was one of Prince Louis’ very first visitors after his birth in April.
Pippa followed in the footsteps of her royal big sister by giving birth in the Lindo Wing of St. Mary’s Hospital — the same place where Kate and Prince William welcomed all three of their royal children.
The new mom is kicking off a baby boom. Meghan Markle and Prince Harry announced on Monday that they are expecting their first child in the spring.
A source previously told PEOPLE that Pippa and her husband, James, are looking forward to settling down and “having children and leading a quiet life.”
And their new baby will have plenty of little playmates. In addition to cousins Prince George, Princess Charlotte and Prince Louis, Matthews’ younger brother, Spencer Matthews, welcomed his first child, a son, with his wife, model Vogue Williams, in early September.
Pippa, 35, and James, 41, tied the knot last year on May 20 at St. Mark’s Church in Englefield. Her royal nephew and niece, George and Charlotte, served in the bridal party.
Middleton confirmed her pregnancy in a June column for the U.K. supermarket monthly Waitrose Kitchen magazine. The then-expectant mom revealed that she did not battle severe pregnancy sickness, or Hyperemesis Gravidarum (HG), unlike Princess Kate.
“I was lucky to pass the 12-week scan without suffering from morning sickness. That meant I was able to carry on as normal,” she wrote.
She stayed active throughout her pregnancy and documented her fitness regime in her ongoing column.
“I’ve noticed my body change, but through exercise I feel it’s being strengthened,” she wrote. “I’m fanatical about sport and have looked at loads of books and websites on exercise during pregnancy, but have been disappointed by the limited technical information what you