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Pregnant Pippa Middleton makes rare public appearance as she attends brother-in-law Spencer Matthews' 30th birthday party

She is expecting her first child with husband James Matthews

Fiona Ward

Pippa Middleton was spotted attending a rare engagement on Sunday - she was photographed arriving at her brother-in-law Spencer Matthews' 30th birthday party, alongside husband James Matthews. The pictures, obtained by the Daily Mail, show the new-mum-to-be wearing a pretty green polka-dot off-the-shoulder dress, a straw bag and simple trainers – the pair even took along their two dogs to the celebration! The party, held at Spencer's London apartment, was also attended by the likes of Millie Mackintosh and Hugo Taylor.

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Pippa has been seen arriving at Spencer's 30th celebrations

The happy photographs showed the party in full swing as guests laughed and chatted on an outdoor terrace – one even reveals a sweet moment between Spencer and Pippa, showing their close bond as Spencer seems to hold a friendly hand to her cheek at one point.

MORE: Pregnant Pippa Middleton poses in a bathing suit and reveals swimming has helped her with bloating

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Spencer's wife, Vogue Williams, who is also expecting her first baby, was also in attendance of course – sharing some birthday hugs with her husband. Made In Chelsea stars Jamie Laing and Oliver Proudlock were also thought to be there.

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Pippa and sister Kate

Pippa is expecting her new arrival in October, and is it's likely that the expectant mother is turning to her older sister Kate for some much-needed advice! News of the pregnancy was first reported just hours before the Duchess of Cambridge went into labour with her third child – at the time it was thought that 34-year-old Pippa was around three months pregnant, meaning the sisters enjoyed a joint pregnancy for some 12 weeks - no doubt strengthening their already-close relationship.

MORE: The espadrilles Pippa Middleton is obsessed with - and the Countess of Wessex has a pair too!

The famous siblings only live a short distance apart - while Prince William and Kate have made Kensington Palace their primary residence, Pippa's west London home is located just a few miles away, allowing them to bring their children closer together. The mum-of-three will surely give her little sister tips on how to decorate the nursery as well as offering advice on baby clothing and food, too.