Feel the burn! Made In Chelsea's Stephanie Pratt shows off her athletic figure in blue sportswear as she works up a sweat in the park

She's broached the subject of her past crystal meth addiction and eating disorders in her shocking new autobiography, Made In Reality.

But Stephanie Pratt proved she's put her insecurities firmly behind her, looking healthier than ever as she enjoyed an outdoor exercise session with her personal trainer in a London park on Saturday.

The Made In Chelsea beauty donned an electric blue sports bra and stripy hot pants to flex her muscles during her tough workout.

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Working up a sweat: Stephanie Pratt was spotted excerising in a London park on Saturday in blue Lycra

Working up a sweat: Stephanie Pratt was spotted excerising in a London park on Saturday in blue Lycra

Stephanie highlighted her flat stomach and athletic frame in her tiny sportswear, with a pair of neon yellow trainers setting off her long legs.

She went virtually make-up free and wore her blonde locks scraped back in a messy ponytail as her trainer put her through her paces.

The 29-year-old star proved she was fighting fit as she performed a series of deadlifts, lunges and stretches, as well as showcasing her impressive stamina by working on her abs in a plank position.

Heavy lifting: The Made In Chelsea star grimaced as she was put through her paces by her personal trainer 

Heavy lifting: The Made In Chelsea star grimaced as she was put through her paces by her personal trainer 

A little tired? The blonde beauty looked like she could do with a break as she performed a series of ball based exercises
A little tired? The blonde beauty looked like she could do with a break as she performed a series of ball based exercises

A little tired? The blonde beauty looked like she could do with a break as she performed a series of ball based exercises

Athletic: Stephanie flaunted her flat stomach in an electric blue sports bra and stripy hot pants

Athletic: Stephanie flaunted her flat stomach in an electric blue sports bra and stripy hot pants

Make a statement in a snake print sports bra from Lululemon like Stephanie

Proving that a killer bod doesn’t come for free, Made In Chelsea star Stephanie Pratt was spotted doing a grueling workout in a London park this weekend.

Though Stephanie was working up a sweat, she still ensured she looked her glamorous self, wearing a statement cobalt blue ensemble featuring lace-up shorts and a snake print sports bra. Stephanie then completed her colorful ensemble with some neon yellow Asics trainers.

Treating yourself to some new workout gear is sure to get you in the mood to work up a sweat in the gym, and Stephanie's blue snake print sports bra is a great statement piece that will brighten up your basics.

Head over to Lululemon to get a similar colorway, or for more choice, check out our edit of slinky snake prints below.

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Huffing and puffing: The 29-year-old concentrated on her breathing patterns as she flexed her muscles 

Huffing and puffing: The 29-year-old concentrated on her breathing patterns as she flexed her muscles 

Long and lean: Stephanie set off her slender legs with a pair of neon yellow trainers 

Long and lean: Stephanie set off her slender legs with a pair of neon yellow trainers 

Showing Josh what he's missing: Stephanie is newly-single after her live-in boyfriend of a year, Josh Shepherd, ended things out of the blue 

Showing Josh what he's missing: Stephanie is newly-single after her live-in boyfriend of a year, Josh Shepherd, ended things out of the blue 

Heartbroken: The star was focusing on staying fit and active in the wake of her emotional trauma 

Heartbroken: The star was focusing on staying fit and active in the wake of her emotional trauma 

Cooling off: Steph ensured she stayed hydrated by sipping on bottled water during her workout 

Cooling off: Steph ensured she stayed hydrated by sipping on bottled water during her workout 

Stephanie seemed especially invested in her boxing session, perhaps imagining her ex-boyfriend Josh Shepherd's face as she fiercely pounded away.

MIC fans saw the star left utterly heartbroken by her E4 co-star on the last episode of the reality series, when her live-in boyfriend ended things out of the blue, claiming he wanted to be single in order to find a job.

‘I think he just wants to hang out in LA and hook up with girls. Three weeks ago he was on his phone googling photos of engagement rings with me. It doesn’t make sense, I feel so dumb’, she sobbed to her best pal Lucy Watson.

In high spirits: The blonde beauty was laughing and joking around with her handsome personal trainer 

In high spirits: The blonde beauty was laughing and joking around with her handsome personal trainer 

Not giving up: Stephanie moved on to the next phase of her workout, getting down on a floor mat

Not giving up: Stephanie moved on to the next phase of her workout, getting down on a floor mat

Stretching it out: The MIC favourite ensured her muscles were warmed up with a series of stretches 

Stretching it out: The MIC favourite ensured her muscles were warmed up with a series of stretches 

Feel the burn: Stephanie's trainer kept her motivated as she powered through a series of crunches 

Feel the burn: Stephanie's trainer kept her motivated as she powered through a series of crunches 

Planking: The former The Hills star worked on her stomach muscles as she got into position

Planking: The former The Hills star worked on her stomach muscles as she got into position

Can I stop now? The E4 star looked rather red in the face as she persevered with her workout

Can I stop now? The E4 star looked rather red in the face as she persevered with her workout

Whipping her into shape: The star's personal trainer was very hands-on during her al fresco exercise session

Whipping her into shape: The star's personal trainer was very hands-on during her al fresco exercise session

Helping hand: He ensured Stephanie's hips were level as she worked on defining her abs 

Helping hand: He ensured Stephanie's hips were level as she worked on defining her abs 

Meanwhile, the stunning star made some shocking confessions this week, opening up about her past drug addiction, which she had previously touched upon during her time on MTV series The Hills.

She writes in her new book: 'I was 14 or 15 (when I first smoked crystal meth).... I was on the extreme level and addiction developed instantly.

'(I smoked) probably four times before school, then at snack... probably 12 or 13 times a day.I didn't care about anything. I could live or die, I didn't care. I had nothing to get out of bed for, nothing was exciting.'

Cooling off: Stephanie, who was hardly wearing an make-up,  released the tension in her body

Cooling off: Stephanie, who was hardly wearing an make-up,  released the tension in her body

Grin and bear it: The blonde beauty was still smiling after her gruelling personal trainer session 

Grin and bear it: The blonde beauty was still smiling after her gruelling personal trainer session 

Flexible: The star had no trouble going through the motions in the park 

Flexible: The star had no trouble going through the motions in the park 

Ouch! Stephanie was sporting several cuts on her left hand and looked like she was in pain 

Ouch! Stephanie was sporting several cuts on her left hand and looked like she was in pain 

Unleashing her pent-up anger: The reality star seemed very invested in her boxing session 

Unleashing her pent-up anger: The reality star seemed very invested in her boxing session 

Take that, Josh! No prizes for guessing who she was picturing as she went through the motions

Take that, Josh! No prizes for guessing who she was picturing as she went through the motions

The turning point for Stephanie came with her 2006 arrest, when she was apprehended by cops in Hawaii for attempting to steal $4,000 worth of designer clothes while under the influence of drugs.

Her parents and brother Spencer - who she starred with on The Hills - subsequently helped her check into a Texas rehab clinic to get clean.

But the pressures of her new-found fame alongside the likes of co-stars Lauren Conrad and Kristin Cavallari led to Stephanie developing bulimia, weighing just seven and a half stone when the reality show came to an end in 2009.

The star has since managed to overcome her dangerous disorder by focusing on clean eating, regular exercise and healthy living rather than deprivation.

Distraught: The MIC couple had been discussing marriage just one week before their split 

Distraught: The MIC couple had been discussing marriage just one week before their split 

Furious: While Stephanie was in floods of tears after their break-up, Josh hardly showed any emotion
Furious: While Stephanie was in floods of tears after their break-up, Josh hardly showed any emotion

Furious: While Stephanie was in floods of tears after their break-up, Josh hardly showed any emotion 

Serious face: The star was totally absorbed in throwing the best punch she possibly could 

Serious face: The star was totally absorbed in throwing the best punch she possibly could 

Knees up! Stephanie is happier and healthier than ever following years of battling an eating disorder

Knees up! Stephanie is happier and healthier than ever following years of battling an eating disorder

Battling her demons: The star first became ill with bulimia when she appeared on MTV show The Hills 

Battling her demons: The star first became ill with bulimia when she appeared on MTV show The Hills 

Turning her life around: She has overcome her issues by focusing on clean eating, regular exercise and healthy living

Turning her life around: She has overcome her issues by focusing on clean eating, regular exercise and healthy living