Bikini-clad Heidi Klum, 42, can't keep her hands (or lips) off boyfriend Vito Schnabel, 29, as they enjoy another picture-perfect day in the Italian sunshine

Their island-hopping summer holiday couldn't get any more sizzling - and that's not just the exotic locations.

Because 42-year-old Heidi Klum and birthday boy Vito Schnabel, 29, have been unable to resist locking lips and tactile displays at every opportunity.

Tuesday was yet more proof that the handsome couple are utterly besotted with one another as they smooched in the sea and ran playfully in and out like young lovers just off the coast of Tavolara Island, Italy. 

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Tactile display: Heidi Klum and Vito Schnabel engaged in a tactile display on Tavolara Island, Italy on Tuesday

Tactile display: Heidi Klum and Vito Schnabel engaged in a tactile display on Tavolara Island, Italy on Tuesday

It's little wonder, because supermodel stunner Heidi looked simply sensational in her swimwear as she paddled by the water's edge. 

She pulled out yet another simple, black bikini but needed no help in making it very distracting, despite the addition of a tomboy cap and mirrored shades.

It fit to her super-lean frame perfectly as she cut a statuesque figure on the rare moments that she was pictured alone that day.

Body confident: Heidi made strides up and down the sand, displaying her lean and elegant physique

Body confident: Heidi made strides up and down the sand, displaying her lean and elegant physique

Be a beach babe in a classic black bikini by Melissa Odabash

Between the likes of Elle Macpherson, Tamara Ecclestone, Cindy Crawford and Heidi Klum, we've been spoilt for choice when it comes to swimwear inspiration recently.

But these ladies have all got one thing in common - they agree that the key to looking good on holiday is a bikini by Melissa Odabash. They're obsessed!

In all its simplicity, this LBB (little black bikini) is genius. Heidi took both the blue and black version with her to St. Tropez and it's easy to see why. The clean lines are perfect for a pared back poolside look, plus the triple strap bottoms give things a sporty spin.

Click the link (right) to buy yours now, then style it some aviator sunglasses à la Heidi and of course a holiday glow!

Or check out the Odabash-inspired bikinis we've found for you elsewhere.

* PRICES MAY NOT BE AS ADVERTISED
Cheeky: Vito patted Heidi's pert derriere as they talked to friends on the sand

Cheeky: Vito patted Heidi's pert derriere as they talked to friends on the sand

Kisses: Heidi leaned in for a tender smooch, not being able to tear away from Vito

Kisses: Heidi leaned in for a tender smooch, not being able to tear away from Vito

The duo, thought to have dated since early last year, were a perfect match in sporty black hats; both backwards as they headed into the water together.

Taking a refreshing dip, Heidi and Vito soon entered into a playful display and splashed around trying to get each other as soaked as possible.

And when they returned, the giddy energy urged Heidi to climb aboard her beau's back and let him carry her out with a piggy back ride as she helped his shoes above the water. 

Playful: They splashed about, engaging in a little light-hearted rough and tumble

Playful: They splashed about, engaging in a little light-hearted rough and tumble

Cute duo: He gave her a hand out of the sea as they both tried to tackle the stones by the shore line

Cute duo: He gave her a hand out of the sea as they both tried to tackle the stones by the shore line

That's more like it: In the end, Vito scooped up his gorgeous girlfriend and she enjoyed a piggy back up the shore

That's more like it: In the end, Vito scooped up his gorgeous girlfriend and she enjoyed a piggy back up the shore

Looking trim: She showed off her super-toned form in black
Youthful: She hid her supermodel good looks beneath a cap

Another day, another bikini: Heidi looked good again in a simple, black bikini

The group had brought picnic snacks to the beach with them, hoping to make quite a day of it as they explored a new holiday hotspot.

Only the previous day, the couple's adorable beach display had been in the Mediterranean Sea near Sardinia.

And before that, Heidi and Vito had been partying with the like of Leonardo DiCaprio in St-Tropez after they spent a few days aboard a luxury yacht. 

Carefree: She let a sarong sweep behind her in the breeze as she walked along the coast line

Carefree: She let a sarong sweep behind her in the breeze as she walked along the coast line

Cheeky: From behind, Heidi shot a glimpse of her incredible figure 

Cheeky: From behind, Heidi shot a glimpse of her incredible figure 

Laugh out loud: Heidi and the group brought along picnic snacks and laughed out loud during the day out

Laugh out loud: Heidi and the group brought along picnic snacks and laughed out loud during the day out

Refreshing up: She looked statuesque as she took a splash

Refreshing up: She looked statuesque as she took a splash

Making a day of it: The friendship group sat and munched snacks as they enjoyed the sun

Making a day of it: The friendship group sat and munched snacks as they enjoyed the sun

Another tender moment: They kissed each other again as they left the beach for the day

Another tender moment: They kissed each other again as they left the beach for the day

Packing up: Once it was time to pack up for the day, it was certain that the pair would have somewhere better to move along to

Packing up: Once it was time to pack up for the day, it was certain that the pair would have somewhere better to move along to

Giggle fest: Even in the boat, Heidi couldn't help but keep contact with her beau

Giggle fest: Even in the boat, Heidi couldn't help but keep contact with her beau

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