The magazine stated on June 5 that Kate Middleton’s younger sister,  Pippa Middleton 38, is expecting her third child with husband James Matthews, citing various sources. They already have a 3-year-old son Arthur and a 14-month-old daughter Grace.

On June 4, spilt the beans of Pippa’s pregnancy after the author made a rare public appearance at the Platinum Party in the Park concert outside Buckingham Palace in London that evening, dressed in a smocked green dress. Pippa and her husband are “very happy,” according to a source, and she is a “natural mama,” according to the site.

Pippa was joined by Matthews, 46, her brother James Middleton, 35, and his wife Alizée Thévenet, as well as her parents Carole and Michael Middleton, at the concert, which was one of several events commemorating Queen Elizabeth II’s Platinum Jubilee.

Read more: Pippa Middleton, Kate’s sister, fuels pregnancy rumours during Jubilee concert

Kate, 40, was seated separately in a royal box with her husband, Prince William, 39, and their three children, Prince George, 8, and Princess Charlotte, 7, the eldest of their three children. Prince Louis, the couple’s 4-year-old son, did not accompany them.

Pippa became famous in 2011 when she served as Kate’s maid of honour during the duchess’ royal wedding to William in front of millions of people across the world. In 2017, Pippa married Matthews, and George and Charlotte were page boys and flower girls, respectively.

Kate’s sister, who is extremely secretive, gave a rare interview last summer in collaboration with sportswear manufacturer Hoka One about staying healthy while parenting. “I’ve been able to combine outdoor exercise while being a hands-on parent by being active with my 2.5-year-old son in the park or playground, transporting him on the back of my bike, and buggy running when he was a newborn,” she told.