Kourtney Kardashian and Kendall Jenner PICTURE EXCLUSIVE: Reality star, 40, and model sister, 23, showcase their toned figures in tiny string ʙικιɴιs as they enjoy family break in Sardinia

She’s been enjoying a family vacation to the idyllic Sardinian holiday spot.

And Kourtney Kardashian was joined by her sister Kendall Jenner for a fun poolside day in Costa Smeralda, Sardinia on Monday.

The mother-of-three, 40, and model, 23, looked sensational as they showcased their toned figures in tiny swimwear.

Family time: Kourtney Kardashian was joined by her sister Kendall Jenner for a fun poolside day in Costa Smeralda, Sardinia, Italy on Monday (L-R)

Kourtney showed off her famous curves in a skimpy peach string ʙικιɴι top with a pair of matching thong bottoms for her fun day by the pool.

She finished her look with a collection of silver earrings and tortoise shell pointed sunglᴀsses for a touch of glamour for her swimwear ensemble.

Kourtney looked every inch the yummy mummy as she styled her wet brunette locks into a loose relaxed hairdo and went make-up free, showing off her radiant complexion.

Feeling peachy: Kourtney showed off her famous curves in a skimpy peach string ʙικιɴι top with a pair of matching thong bottoms for her fun day by the pool

Model behaviour: Meanwhile, her younger sister Kendall opted for a tiny fuchsia pink triangle string ʙικιɴι as she showed off her model physique by the pool

Glamorous: She finished her look with a collection of silver earrings and tortoise shell pointed sunglᴀsses for a touch of glamour for her swimwear ensemble

Yummy mummy: Kourtney looked every inch the yummy mummy as she styled her wet brunette locks into a loose relaxed hairdo and went make-up free, showing off her radiant complexion

Sister time: The two sisters appeared deep in thought as they spent some special time together catching up on holiday

Relax: Kendall appeared in her element as she read a book on the sun lounger while Kourtney went on her mobile

Selfie: Kourtney looked incredible and couldn’t resist taking a selfie of herself in the holiday destination
Meanwhile, her younger sister Kendall opted for a tiny fuchsia pink triangle string ʙικιɴι as she showed off her model physique by the pool.

The reality star turned model opted for a touch of 90s as she styled her brunette locks into a high ponytail with a white scrunchie, she added a pair of tortoise shell sunglᴀsses and appeared to go make-up free in order to soak up the sun.

Kendall was later seen wrapping a white fluffy towel around her waist as she held a collection of books, no doubt enjoying some relaxing reading away from her hectic schedule.

Natural beauty: Kendall appeared to go make-up free as she showed off her radiant complexion

Retro: Kendall opted for a touch of 90s as she styled her brunette locks into a high ponytail with a white scrunchie, she added a pair of tortoise shell sunglᴀsses and appeared to go make-up free in order to soak up the sun

Motherhood: As well as her sister Kendall, Kourtney has been joined by her children – Penelope, seven, Mason, nine and Reign, four, on the fun holiday, whom she shares with her ex Scott Disick

Moving on: Scott is now dating Sofia Richie, the 20-year-old daughter of singing legend Lionel Richie, while Kourtney is currently single

Soaking up the sun: The two stars couldn’t resist soaking up the sun on the poolside sun loungers

Staying hydrated: Kourtney was seen sipping on a glᴀss of water as she stayed hydrated in the heat

Sizzling: Kourtney credits her sizzling summer body to the keto diet, which she resumed for the summer, she blogged on her site Poosh
As well as her sister Kendall, Kourtney has been joined by her children – Penelope, seven, Mason, nine and Reign, four, on the fun holiday, whom she shares with her ex Scott Disick.

Scott is now dating Sofia Richie, the 20-year-old daughter of singing legend Lionel Richie, while Kourtney is currently single.

The amicable co-parents last split up in 2015 and Scott still has warm relations with the Kardashian-Jenner family overall.

Busy bee: ‘It’s not even about willpower as much as it is convenience. Running around with my kids, attending events and meetings, and keeping myself fuelled for my busy schedule is the real challenge,’ dished the siren

Sweet: Kourtney hugged her son, Mason, nine on the sun loungers while sister Kendall took pH๏τos

In fact, Sofia was seen emerging from dinner with Kourtney’s half-sister Kylie Jenner on Saturday night at the West Hollywood nightspot The Nice Guy.

During the holiday season this past December, Sofia joined Kourtney and Scott for a family trip with their children to Cabo.

Kourtney credits her sizzling summer body to the keto diet, which she resumed for the summer, she blogged on her site Poosh.

Quick and easy: The ‘Gluten-free, carb-free, keto cauliflower pizza crust’ from Poosh’s recipe developer Chef Sara takes 40 to 45 minutes to make

‘Never better’: ‘My body never looked better than when I did the keto diet two and half years ago, when I did it for two months,’ she said

‘Starting keto isn’t the hard part. I’m usually excited and generally looking forward to the way I feel on it. Staying with it is the hard part,’ she confessed.

‘It’s not even about willpower as much as it is convenience. Running around with my kids, attending events and meetings, and keeping myself fuelled for my busy schedule is the real challenge,’ dished the siren.

Kardashian went on the keto diet for the second time this summer, and shared her favourite healthy recipes with followers this week.

Taking a pH๏τo: Kendall couldn’t resist taking several pictures of the idyllic scenery no doubt for her Instagram

Her latest go-to food, which she promoted on Instagram, is a cauliflower pizza crust, which she says is a low-carb, healthy alternative to traditional pies.

According to her website, Poosh , the ‘deliciously healthy’ dish ‘makes for a tasty midday snack, lunch, or dinner meal.’

The ‘Gluten-free, carb-free, keto cauliflower pizza crust’ from Poosh’s recipe developer Chef Sara takes 40 to 45 minutes to make.

The crust is made from grated cauliflower, cauliflower rice, Parmesan cheese, an egg, and spices.

On top, she puts three kinds of cheese, basil, pepper, and olive oil — but no sauce. However, Chef Sara says home cooks can feel free to add whatever sauce they like.

The recipe is just the latest in a list of keto-friendly foods Kourtney has promoted, which have also included a low-carb cheesecake, gluten-free meatballs, and ‘Coconut Butter Keto Cups’.

Fruit: Kourtney enjoyed a refreshing snack of a plate of fruit as she enjoyed her holiday on Monday

Kourtney got back on the keto diet in time for summer, explaining on her site : ‘We wait all year for summer, and when it finally rolls around, I want to look and feel my best.’

‘My body never looked better than when I did the keto diet two and half years ago, when I did it for two months,’ she said.

‘In my experience, I’ve found the best method to train my body to curb sugar cravings, burn fat, and kick-start weight loss is by sticking to a keto diet.’