They haven’t been shy about showing their affection for one another while holidaying in Formentera so far.

And Ruby Rose and her girlfriend Harley Gusman couldn’t resist indulging in a cheeky spot of PDA as they frolicked on board a yacht just off the shores of the Balearic island.

The tattooed Orange Is The New Black favourite, 30, was seen cuddling up to 24-year-old Harley on the boat, with the blonde nuzzling up to Ruby’s neck.

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Cosying up: Ruby Rose and her girlfriend Harley Gusman couldn’t resist indulging in a cheeky spot of PDA as they frolicked on board a yacht in Formentera on Thursday.

The Australian beauty was displaying her seriously ripped figure in a white sporty bikini top, complete with cut-out detailing and black criss-cross stitching.

Her defined abs were on full display, with her impressive collection of tattoos further serving to enhance her rippling stomach muscles.

The revealing top allowed onlookers to admire her various tattoos, including a red and yellow koi fish tattoo on her upper right arm, and a set of playing cards on her upper left chest.  

Meanwhile, Harley flaunted her peachy posterior in a simple black one-piece, which highlighted her trim frame.

Making a splash: Ruby (L) and Harley (R) both looked sensational in their sporty swimwear as they lapped up the sunshine.

Romantic swim: The lovebirds were seen embracing in the water, clinging on to one another during their dip in the ocean.

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Killer body: The model and actress was showcasing her enviable abs and impeccably toned figure.

All aboard! The lovebirds were joined by a host of friends on board the boat for the afternoon.

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Quirky look: The TV favourite was sporting eye-catching blue braids in her short hairdo.

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Simple swimwear: Harley flaunted her peachy posterior in a simple black one-piece, which highlighted her trim frame.

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It was plain to see the passion between them as they cuddled up on board the yacht, where they were joined by a group of friends.  

Earlier in the day, Ruby showed off her washboard stomach and silky, sun-kissed skin in a pair of oversized denim cutoffs.

With her bikini top acting as an anchor for her entire ensemble, she threw on a matching white button-up with black design elements, and she painted her perfectly manicured nails with matching white polish.

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Staying hydrated: Ruby was seen sipping from a bottle of fizzy water as she soaked up the sun.

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Catching up: The gal pals chatted well into the evening as they enjoyed some rest.

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She and her girlfriend Harley went public with their relationship after frolicking on the beach as part of Taylor Swift’s girl squad on the Fourth of July.

And it seems that they are still in the throws of their honeymoon period, as the pair stayed close both on the shore and in the sea, where they appeared to snuggle beneath the warm Mediterranean waters.

Born in Miami, Harley is the co-founder of Truly Organic, a luxury line of organic skin and hair products, which may explain her radiant complexion and even skin tone.

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Washboard stomach: Earlier in the day, Ruby slipped into denim cutoffs and a white bikini top as she enjoyed the sand and sun of the Spanish island of Formentera.

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So happy together: The Orange Is The New Black star was inseparable from her girlfriend.

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Can you take our picture? Harley seems totally at ease with Ruby’s significantly higher profile, at times offering to take snaps of Ruby with her adoring fans.

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As Ruby flaunted her gym-honed body, Harley stayed under wraps, choosing a relatively modest black one-piece that kept her assets firmly under wraps.

She took to the water like a fish, at time straddling a water bike, all the while keeping her eyes on her much more famous girlfriend.

Harley seems totally at ease with the mismatch in their public profiles and happily watched as strangers and acquaintances asked for pictures with Ruby, some of which Harley was kind enough to snap herself.

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Speed demon: Harley looked endlessly glam as she straddled a water bike.

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Drying off: Rather than air drying, Ruby used a black towel to pat herself down after her swim.

Ruby has been making waves in Hollywood ever since her breakout role in the third series of Orange Is The New Black.

On Wednesday The Hollywood Reporter revealed that the Australian beauty is in negotiations to star alongside Fan Bingbing and Jason Statham in the sci-fi flick Meg.

Statham plays a former Naval captain and expert diver recruited to rescue Chinese scientists stranded at the bottom of the Mariana Trench and under attack by a prehistoric ancestor of the Great White shark.

Rose is slated to play Jaxx, described as a kick-ass engineering genius and member of the stranded marine research team. 

Jon Turteltaub, perhaps best known for the National Treasure movies, will direct.

Producers plan to release the film on March 2, 2018.