It might be the last few days of the summer holiday but for the Duchess of Cambridge, the fun is far from over!
On Monday, Pippa Middleton turned 38 and, given the sisters' close bond, it's highly likely that they will spend some time together celebrating her special day - not least because of their close proximity.
MORE: The Queen shares heartfelt message from Balmoral
WATCH: Kate and Pippa Middleton are #sistergoals
While Kate recently returned to Kensington Palace with her husband Prince William and their three children, Prince George, Princess Charlotte and Prince Louis, her younger sibling lives just a short distance away in the sought-after area of Chelsea.
READ: Pippa Middleton's dazzling £250k engagement ring has surprising royal link
MORE: Discover new mum Pippa Middleton's typical day on a plate
Pippa, her husband James Matthews and their two children Arthur, two, and baby Grace have a stunning six-bedroom house that is reportedly worth £17million.
Pippa and Kate are incredibly close
The luxury five-storey house includes a gym, a lift, a room for staff and even an underground cinema.
READ: Pippa Middleton makes rare comment about son Arthur's upbringing
MORE: Kate Middleton and sister Pippa's £1.88million flat they lived in for free
Kate will be making the most of her children's last few days of the holidays. Prince George and Princess Charlotte will soon return to their classrooms at Thomas's Battersea school in south-west London. George will start Year 4, while Charlotte is moving up to Year 2.
Pippa shares two children with husband James Matthews
Meanwhile, Prince Louis, three, will be heading back to Willcocks Nursery School, where he was enrolled in April.
READ: Pippa Middleton's subtle tribute to sister Kate Middleton's royal wedding
MORE: Pippa Middleton and James Matthews' incredible wedding day in photos
The Cambridges no doubt spent a great deal of time outdoors over the summer. It's a passion that Kate shares with Pippa as a result of their happy childhood.
Prince George and Princess Charlotte will soon return to school
Speaking on the Happy Mum, Happy Baby podcast in 2019, Kate shared: "As children, we spent a lot of time outside, and it’s something I'm really passionate about.
"I think it's so great for physical and mental wellbeing and laying foundations. It's such a great environment to spend time in, building those quality relationships without the distractions of 'I've got to cook' and 'I've got to do this.' And actually, it's so simple."
Kate has spoken of the benefits of the great outdoors
It's an ethos Pippa shares. In a recent interview with running shoe brand Hoka One One, she revealed: "Being such an active family has rubbed off on my son, he loves nothing more than running wild in the woods, parks and fields with our two dogs, even if it's howling a gale and pouring with rain."
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity, royal and lifestyle news delivered directly to your inbox.
