Kourtney Kardashian shows off her amazing figure in sexy black one-piece as she spends day on yacht in Italy

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She's been enjoying a fun getaway in Italy with her children and mom Kris Jenner.

And Kourtney Kardashian showed off her fit figure in another sexy one-piece as the family spent the day on a luxury yacht off Portofino on Monday.

The reality star, 37, wore a black swimsuit with a tan design as she played in the water with daughter Penelope, 4, and son Mason, 6, as son Reign, 20 months, looked on. 

Italy trip: Kourtney Kardashian showed off her toned figure in a black one-piece swimsuit with a nude 'Y' front design while out on the water in Portofino on Wednesday

Kourtney has been vacationing in Italy with mom Kris Jenner,60, and her boyfriend Corey Gamble, this week.

And the group looked like they were having a blast as they jumped off the side of their yacht and splashed around in the water, before heading back to dry land for some shopping.

Kourtney showed off her amazing figure in a dark bathing suit featured a scoop-necked design, a high-cut leg and a nude 'Y' design.

The stylish reality star added oversized, futuristic sunglasses and gold bangles as they enjoyed some fun out on the water. 

Fitness fan: The mother-of-three showed off the results of her dedicated workout schedule

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Kourtney Kardashian has been showing off her satiable curves in another sexy one-piece as the family spent the day on a luxury yacht off Portofino.

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Family trip: Kourtney's daughter Penelope wore a cute striped swimsuit with ruffles

Helping hand: The doting mom kept a tight grip on the four-year-old as they descended the steps of their luxury yacht

Hot mama: The 37-year-old looked great as she donned another sexy one-piece 

All smiles: Kourtney helped Penelope into the water as son Reign looked on

Water babies: The four-year-old kept a grip on her mom as she ventured into the water

The doting mother-of-three kept a close grip on three-year-old Penelope, carefully carrying her daughter down the steps of their yacht and easing her into the water once her life vest was secure.

The three-year-old wore a cute stripped swimsuit with ruffles and a halter neck, and smiled as she ventured into the waves.

Kourtney showed them how it's done, yelling with delight as she jumped off the deck and splashed into the water.

There she goes! The reality star let out a yell as she plunged into the water

Tough landing: Kourtney made a big splash as she leaped into the ocean

Kardashian kurves: The E! star put her figure on show in a dark swimsuit while on vacation in Italy with mom Kris and her children

Yacht life: Kourtney adjusted her bathing suit after climbing out of the water

Kourtney then coaxed son Mason, who stayed safe with a bright blue life vest, into joining her in the water.

He was helped off the yacht by grandmother Kris, who also wore a black one-piece and covered up with a pretty pink wrap while on the deck.

Once in the water, Kris wrapped a dark towel around her waist as she guided Mason down the steps.

The six-year-old then joined his mom as they played with small jet skis and floated in the water. 

You can do it! Kourtney gave Mason some reassurance as they tackled the water together

Grandma time: Kris Jenner, 60, also wore a dark one-piece and covered up in a dark towel

Swim time: Mason wore a bright blue life vest as he joined Kourtney in the water

Chilling: The KUWTK star showed off her floating skills

Having fun: Mason was all smiles as they tackled some jet skis

Always stylish: Kourtney kept her oversized sunglasses on as they frolicked in the water

Big kick: The reality star appeared to be having a blast on some small jet skis

Side by side: Kourtney kept an eye on Mason as they played in the water on Monday

Vacation style: Kris, 60, covered up in a pretty pink wrap 

Toweling off: Kris' boyfriend Corey Gamble handed her a towel as she headed into the water

Having fun: The reality TV matriarch chatted with Corey as he went for a swim with his shirt on

Kris' tour manager boyfriend Corey also went for a dip, keeping his white shirt on as he joined the momager in the sea. 

After going for a swim, the group were then spotted browsing some local stores along the waterfront.

Kourtney continued the nautical theme with a cute cap, which she paired with an off-the-shoulder blouse with flowing sleeves.

The KUWTK star added tight black bike shorts and black loafers with a gold buckle.

She left her dark hair down and added mirrored sunglasses and a gold Chanel necklace. 

Gorgeous: Kourtney shared a snap of another sexy swimsuit

The day before the mother of three wore a one strap swimming costume for a some fun on  yacht

La dolce vita: Kourtney kept up the nautical theme with a cute cap once back on dry land

Family fun: The 37-year-old wore an off-the-shoulder top with black bike shorts

Vacation: Kourtney added black flats and a gold Chanel necklace

Doting grandma: Kris wore a stylish zebra-print maxi dress as they strolled along the water

Kourtney slung a small black handbag over her shoulder and added frosted peach lipstick.

The group looked relaxed as they strolled along the water's edge and then browsed a local clothing store for some Italian fashion.

Little Penelope looked sweet in a pink floral dress with a ruffled hem, and carried her own red handbag.

Reality matriarch Kris wore a floor-length, zebra-print coverall over black leggings as she held hands with her granddaughter.

Looking for bargains? The KUWTK stars stopped into a local store to check out some Italian fashion

Off-the-shoulder: Kourtney paired her flowing top with tight black bike shorts

Too cute: Kourtney shared a photo of Penelope as they vacationed in Italy on Monday

Gorgeous: The reality star shared some scenic shots of the area with fans on Instagram

Not bad: Kourtney showed off their amazing view as the family dined in Portofino

The 60-year-old added large silver earrings and oversized sunglasses, and held her granddaughter's hand as they checked out the sights.

Absent from the fun was Kourtney's ex and the father of her children, Scott Disick.  

And the self-styled 'Lord Disick' shared a photo of himself stretched out under a blanket as he complained about traveling alone.

Tough life: Meanwhile, her ex Scott Disick shared an Instagram snap about the difficulties of traveling alone

'Hate traveling alone especially with poor people,' he tweeted as he shared the post on Instagram. 

'Always a hard day traveling with my friend,' he added.

The 33-year-old and Kourtney split last summer, after nine years together. 

Break time: Penelope wore a cute ruffled dress with a red poppy design and matching red sneakers

Relaxing: Kourtney and the kids stopped for a breather as they visited the scenic spot

What's Kim up to? The reality star quickly checked her phone as she kicked back with mom Kris