Khloe Kardashian and Tristan Thompson passionately kiss in pool as he takes loved-up selfies in Mexico... days after labelling their relationship 'complicated'

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She labelled her relationship with cheating boyfriend Tristan Thompson 'complicated' on Thursday night at younger sister Kylie Jenner's 21st birthday party. 

And it now appears as though Khloe Kardashian, 34, and her baby daddy, 27, are in a better place, spotted putting on a passionate display in a swimming pool, while vacationing in Puerto Vallarta, Mexico.

The pair who are holidaying with sister Kendall Jenner, 22, and her boyfriend Ben Simmons, also 22,  couldn't help but turn up the heat while relaxing in a pool.  

It's on! Khloé Kardashian turned up the heat with beau Tristan Thompson as they passionately kissed in a swimming pool in Puerto Vallarta, Mexico on Sunday, after labeling her relationship 'complicated' at sister Kylie Jenner's birthday party

Looking incredible: Khloé was seen wearing a black low-cut one-piece for the pool day which flattered her gym-honed figure perfectly

Khloé was seen wearing a black low-cut one-piece for the pool day which flattered her gym-honed figure perfectly. 

She protected herself from the sun with a burgundy colored wide brimmed hat and a pair of oversized sunglasses.  

The pair who spent much of the afternoon in the pool were also seen taking a slew of loved up selfies when back on land as well. 

Say cheese! The pair who spent much of the afternoon in the pool later documented their kisses with selfies as they left the pool and wrapped themselves up in towels

Stylish: Khloé was seen wearing a black low-cut one-piece and burgundy wide brimmed hat for the pool day

Mystery solved? It seems Khloe was finally ready to admit that her relationship with Tristan Thompson is complicated when she attended Kylie Jenner's 21st birthday party on Thursday night

Tristan opted for go shirtless for the summer day, sporting a pair of black and white board shorts.

The loved up couple are currently vacationing and close family friend Joe Francis' home. 

And they weren't alone, seen enjoying the day with sister Kendall Jenner, her fellow NBA boyfriend Tristan Thompson and a couple of other pals. 

Keeping cool: Tristan opted for go shirtless for the summer's day, sporting a pair of black and white board shorts

Contacts: The loved up couple are currently vacationing and close family friend Joe Francis' home

Fun filled day! And they weren't alone, seen enjoying the day with sister Kendall Jenner, her fellow NBA boyfriend Tristan Thompson and a couple of other pals

Mesmorised: Khloe was seen taking various photos of the picturesque location throughout the day

Kendall spent the day flaunting her incredible trim physique in a sky blue bikini which showed off her model figure.

The Vogue model had her brunette locks slicked back and accessorised with a pair of round shades and was make-up free, letting her natural beauty shine through.  

Ben was seen wearing a pair of blue board shorts and spent most of the day by her side.

Couples' retreat: Kendall walked tall in her blue two piece (left) as she headed towards the water, while Ben (right) was never far from her side 

Beauty: The Vogue model had her brunette locks slicked back and accessorised with a pair of round shades

Stunner: Kendall spent the day flaunting her incredible trim physique in a sky blue bikini

And the boyfriends of the sisters seemed to have much to discuss, photographed taking a stroll together along the beach. 

Having spent much of the day relaxing by the pool, Kendall and a few friends picked up and hopped on some jet skis. 

The beauty kept safe in an orange life jacket. Tristan was also seen giving the water spot a go. 

Time for some fun! Having spent much of the day relaxing by the pool, Kendall and a few friends picked up and hopped on some jet skis

Safety first! The beauty kept safe in an orange life jacket and remained focused 

Water sports: Tristan also gave the jet ski a go, also wearing an orange life jacket 

Lots to talk about! And the boyfriends of the sisters seemed to have much to discuss, photographed taking a stroll together along the beach

The family vacation comes a few nights after Khloé was seen clutching a green Solo cup while rolling solo at her half-sister Kylie Jenner's 21st birthday bash at West Hollywood hotspot Delilah. 

The Lip Kit mogul had asked her guests to define their relationship status with either a pink (taken) cup, yellow (single AF) cup, or green (it's complicated) cup.

It's unclear if Kardashian and Thompson's four-month-old daughter True joined them for their seaside vacation, and he also has a 20-month-old son Prince Oliver with ex-partner Jordan Craig.

Keeping casual: Ben was seen wearing a pair of blue board shorts and spent most of the day right by her side

The Good American jeans co-founder welcomed True on April 12, just days after Dailymail.com revealed that her NBA boyfriend had allegedly cheated on her with several women.

Just last week it was reported that the Cleveland Cavaliers center had 'gotten handsy with a young and sexy woman' while teaching his camp at the Toronto Pan Am Sports Center - according to Radar Online.

Tristan will kick off the NBA season with his teammates on October 17 against the Toronto Raptors followed by their first home game October 21 against the Atlanta Hawks.

On Friday, Khloe announced that Twisted Sisters, the Investigation Discovery's six-part true-crime series she executive produced, would officially premiere September 3.

And the 15th season of Keeping Up with the Kardashians currently airs Sundays as part of her family's massive $100M deal with the E! Network through 2020 - according to Variety.

Trouble in paradise? So much fun! The family vacation comes a few nights after Khloé was seen clutching a green Solo cup while rolling solo at her half-sister Kylie Jenner's 21st birthday bash at West Hollywood hotspot Delilah

Bombshell: The Good American jeans co-founder welcomed True on April 12, just days after Dailymail.com revealed that her NBA boyfriend had allegedly cheated on her with several women