Is Pippa Middleton pregnant? Kate's sister wows in green dress at Jubilee party

Pippa Middleton was in attendance at the Platinum Party at the Palace. (Getty Images)
Pippa Middleton was in attendance at the Platinum Party at the Palace. (Getty Images)

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Royal watchers have suggested that Pippa Middleton may be pregnant with her third child after she appeared to reveal a baby bump at the Platinum Party at the Palace.

The Duchess of Cambridge's younger sister, 38, was spotted at the star-studded event on Saturday evening as part of a third day of celebrations marking the Queen's jubilee.

Just like her stylish sibling, the mother-of-two wowed in a long-sleeved green shirred silk maxi dress from ME+EM.

She finished off her look with her brunette hair in relaxed waves and accessorised with dainty jewellery.

The Duchess of Cambridge's sister appeared to be showing off a baby bump. (Getty Images)
The Duchess of Cambridge's sister appeared to be showing off a baby bump. (Getty Images)

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Middleton shares son Arthur, three, and daughter Grace, one, with husband James Matthews, 46.

She married the hedge fund manager – who is the older brother of Made In Chelsea star Spencer Matthews – in 2017.

While a pregnancy hasn't been confirmed, many viewers watching the royal show at home suggested on social media that she had a baby bump.

Her representatives declined to comment when approached for comment by Hello! magazine.

The mother-of-two is married to James Matthews (the couple are pictured in January). (Getty Images)
The mother-of-two is married to James Matthews (pictured in January). (Getty Images)

Last summer, Middleton opened up in an interview about the struggles of balancing exercise with raising a family.

Speaking to a running shoe brand, she said: "More recently, over the past two years, family life and motherhood has consumed much of my spare time and unsurprisingly the challenges I thrived on have taken a back seat.

"Running and fitness still form part of my weekly routine but not to the level it was before. My running has been more after babies and toddlers than crossing finish lines, which I’m fine with – for now!"

Mabel, Queen and Diana Ross were among those to perform on stage during last night's evening of entertainment watched by many senior royals.

These included the Duke and Duchess of Cambridge, as well as their eldest two children Prince George and Princess Charlotte.

Shop Pippa's dress: Silk Shirred Maxi Dress | £495 from ME + EM

Watch: Star-studded concert celebrates Queen's Platinum Jubilee