'Should probably say goodbye to this bod': Bikini-clad Lucy Watson flaunts her perky posterior in sizzling throwback snap... as she jokes about preparing for Christmas festivities

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She enjoyed a sun-soaked trip to Tulum, Mexico earlier in this year with her beau James Dunmore.

And in the midst of all her festive planning, Lucy Watson began to reminisce about her incredible holiday as she shared a bikini-clad throwback on her Instagram feed on Sunday.

The 26-year-old former Made in Chelsea star showcased her enviable abs and narrow waist in her red two-piece as she posed on a sun lounger infront of a breath-taking backdrop of the Caribbean sea.

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Incredible: Lucy Watson began to reminisce about her incredible holiday as she shared a bikini-clad throwback on her Instagram feed on Sunday

Aside from showcasing her cleavage in her tiny triangle silhouette top, she flaunted her pert derriere and slender pins in her skimpy Brazilian-shaped bottoms at the Sanará resort.

The E4 star complemented her beach attire with a pair of oversized shades and left her glossy brown locks loose in a straight style which cascaded down her back.  

Feeling nostalgic, Lucy playfully joked that she was saying goodbye to her sensational figure for the festive season.

She wrote alongside the photo: 'Should probably say goodbye to this bod before I get knee deep in Xmas festivities

Loved-up: Lucy is happily dating James Dunmore - who also appeared on MIC

Her throwback post comes after the stunning brunette took to Instagram in August to update fans on her picturesque lifestyle with a series of sizzling summer snaps including a pool picture that showcased her stunning figure.  

Famed for her strict vegan diet Lucy showcased her uber-toned figure in another selfie where she lay sprawled on a bed while sunning herself in the idyllic holiday spot.   

Showing off her pert derriere in a pair of denim hot pants, the Made in Chelsea favourite soaked in the sun capturing the last of the holiday rays.

Meanwhile the star sizzled last month in a tiny white bikini which made the most of her stunning frame as she draped herself against a window to best show off her sizzling frame atop her exquisite holiday surroundings.

Peachy! Lucy is naturally keen to flaunt the fruits of her healthy labour as she shared an incredibly sexy belfie from her sun-drenched getaway to Mexico with her boyfriend James Dunmore

Lucy and her boyfriend departed hit reality show Made In Chelsea last year to focus on their relationship, after meeting on the show two years prior.  

The couple proved their romance is stronger than ever as they marked a major milestone, buying their first home together and enjoying yet another holiday.

As she continues on the break, she is naturally keen to keep her 1.4million followers updated as she shared her sizzling snap in the white bikini.

In another sexy shot from her holiday just days before, she shared a sweet snap of herself flashing her pert posterior in a tiny ivory bikini as she wrapped her legs around her hunky beau and planted a sweet smooch on his lips.

On the up: The former Made In Chelsea star sizzled in a tiny white bikini which made the most of her stunning frame as she draped herself against a window to best show off her sizzling frame atop her exquisite holiday surroundings

Milestone: In another sexy shot from her holiday, she shared a sweet snap of herself flashing her pert posterior in a tiny ivory bikini as she wrapped her legs around her hunky beau and planted a sweet smooch on his lips

Revealing their big relationship news, she captioned the snap 'adventures with this one are quite great @james_dunmore and today we bought our first house together'.

Strapping James matched his lady love in a pair of sparkling white shorts as he effortlessly lifted Lucy up, showing off his muscular arms. 

Lucy and James met on MIC in 2015 and their romance was documented on the reality show.

Clearly stronger than ever, the pair were both absent from the MIC spin-off in the South of France last August - wanting to spend time alone and away from drama instead.

Loved up: Revealing their big relationship news, she captioned the snap 'adventures with this one are quite great @james_dunmore and today we bought our first house together'

It was then announced in September that Lucy was leaving the E4 show that catapulted her to fame four years ago. 

A spokesperson told MailOnline: 'After four amazing years on Made In Chelsea, Lucy feels that now is the right time to explore some other exciting opportunities and projects that she is passionate about.

'Being part of such a successful show has been an incredible experience for her, and she wishes everyone involved all the very best for the future.'

Her friend and co-star on the show Frankie Gaff then revealed the brunette was taking time away from the spotlight to concentrate on her relationship with James.

Strength to strength:  The pair are currently holidaying in Mexico, with crystalline waters and white sand beaches visible in the background of the stunning snap

The Made in Chelsea star told BANG Showbiz: 'Lucy's not going to be in the next series. At the moment she's decided not to because she's loved up.'

Speaking to FEMAIL last year, Lucy revealed how she developed a passion for health and fitness over the past two years, explaining: 'I'm motivated by people around me and I just got to a point in my life where I needed a change.'

Before she added: 'I don't want to emulate anyone else's body. I just want mine to be toned and lean. I don't want to lose any weight or curves, just tone up what I already have.'

The star further revealed on Twitter in 2015 that switching up her diet to one of veganism has made a big difference to her health and figure.

'Yes lost a lot of weight since becoming vegan. Feel so much healthier though. And better for the animals’ she tweeted in May.

However after receiving backlash for being 'too skinny' and receiving concerns from fans about her health, Lucy hit back in a second message to justify her actions.

She wrote to her haters:‘I’m the healthiest I’ve ever been, the body shaming needs to stop…Some people are skinny, some people are fat. GAF.' 

Toned: Speaking to FEMAIL last year, Lucy revealed how she developed a passion for health and fitness over the past two years, explaining, 'I'm motivated by people around me and I just got to a point in my life where I needed a change'