Kate Middleton’s sister Pippa is pregnant with her third child.

The 38-year-old arrived at the Party at the Palace concert in London on Saturday dressed in a stunning green dress and cradling her baby bump.

Pippa, who is already a mother to Arthur, three, and one-year-old Grace, appeared to be all smiles as she watched the historic 70-year celebrations at Buckingham Palace.

Sources close to Pippa and her husband James told Page Six that the loved up couple are “so happy” to be expecting again and to expand their family.

Pippa married James, a British motorsports racing driver and hedge fund manager, back in 2017.

The couple are yet to formally announce that Pippa is pregnant with their third child.

Despite being the sister of the Duchess of Cambridge, Pippa made headlines at Kate and Will’s wedding thanks to her backside.

She joked about the incident and even compared it to Kim Kardashian’s bottom.

“I must say that [my backside] — though it has enjoyed fleeting fame — is not comparable [to Kardashian’s],” she previously wrote in the UK’s Spectator.

Images: Getty Images

This article first appeared on OverSixty.