'What a perfect night!' Overzealous Stephanie Pratt suffers wardrobe malfunction as she flashes her bra during giddy dinner with brother Spencer and sister-in-law Heidi

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They share a famously tumultuous relationship. 

Yet Stephanie Pratt's feelings towards her brother Spencer and his beloved wife Heidi appear to have truly warmed as she was spotted on a giddy night out with the couple in London on Saturday night. 

The 30-year-old reality star could not stop laughing during the plush night at The Dorchester Hotel, although her giddy antics culminated in an unfortunate wardrobe malfunction as she flashed her nude bra through her skimpy dress. 

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Oops! Stephanie Pratt's feelings towards her brother Spencer and his beloved wife Heidi appear to have truly warmed as she was spotted on a giddy night out with the couple in London on Saturday night

Stephanie soared to fame when she entered The Hills as a secondary cast member, embroiled in storylines involving central characters Heidi and Spencer. 

Initially starting as bosom buddies with the happy couple, their relationship soon descended into misery as a feud sprung - culminating in screaming rows between the trio and producers allegedly urging Spencer to punch his sister.

Now however the family appear to have built bridges, with the Made In Chelsea star joining the couple in the capital, shortly after their eviction from the Celebrity Big Brother house earlier in the week.

As the trio, who were joined by fellow CBB stars Ola and James Jordan, larked around outside the plush hotel Stephanie's lilac dress slipped to expose her lingerie. 

Oh dear... The 30-year-old reality star's giddy antics culminated in an unfortunate wardrobe malfunction as she flashed her nude bra through her skimpy dress (pictured with James and Ola Jordan)

Lost love: Stephanie soared to fame when she entered The Hills as a secondary cast member, embroiled in storylines involving central characters Heidi and Spencer

The stunning blonde looked incredible in her thigh-skimming mini, which made the most of her endless legs, yet the plunging neckline seemed to cause her some gripe as she flashed her nude bra from beneath the gown. 

Ensuring she kept out the blistering cold, she layered her outfit beneath a stunning faux fur coat which injected a touch of glamour into the ensemble. 

Clearly having a wonderful time on the night on the town, Stephanie took to Twitter to keep her followers up to speed on the events of the evening. 

Beaming beauty: Initially starting as bosom buddies with the happy couple, their relationship soon descended into misery as a feud sprung culminating in screaming rows between the pair and producers allegedly urging Spencer to punch his sister

Reaching out to her 924,000 fans, she penned: 'Spencer doesn't like my perfume whatevs bffs!!!!!!!... Thanks for dinner Spencer, Heidi, James and Ola, what a perfect night of laughter!!!... 

'I could watch James and Spencer chat all day long- I AM HOWLING!!!! Omg #bestnightever... Don't u forget that 5th wheel!!! I am so excited for this debrief!!!'

Not content with being accompanied by such a glamorous dinner companion, Heidi also oozed sexy sophistication in a chic embellished mini skirt paired with a polo neck. 

Troubled: Back in 2011, Spencer revealed the depths of his relationship with Stephanie in an interview with the Daily Beast, as he described an incident where he claimed The Hills producer Sara Mast encouraged him to become violent with his sister

Stunner: Not content with being accompanied by such a glamorous dinner companion, Heidi also oozed sexy sophistication in a chic embellished mini skirt paired with a polo neck

She wore her tresses in loose waves while also opting for heavy make-up to help enhance her dazzling, pretty features. 

Back in 2011, Spencer revealed the depths of his relationship with Stephanie in an interview with the Daily Beast, as he described an incident where he claimed The Hills producer Sara Mast encouraged him to become violent with his sister.

The famed TV executive allegedly referenced the infamous Jersey Shore incident in which Nicole 'Snooki' Polizzi was punched by a male stranger in a bar.

Hey there! It was clear to see all parties involved on the evening were in a playful mood

'That’s when I snapped,' Spencer told The Daily Beast. 'To the point when I said - and this is when the producers got scared of me...

'"You want me to punch my sister in the face? Are you trying to get me to kill you?" I didn’t say, "I’m killing you." If I did, MTV would have had me arrested.' 

On a recent episode of E4's Virtually Famous, protective Stephanie appeared to clash with outspoken Vicky Pattison when she branded Heidi 'a moron'.

Glam: Ola and James Jordan looked typically glamorous for the night out 

Meeting the pals: Spencer and Heidi were happy to pose with fans 

Vicky's awkward outburst left Made In Chelsea's Stephanie visibly aghast and ultimately speechless, in a clip released to MailOnline.

'Isn't she just a bit of a moron?' asked Vicky, cringing as soon as another co-panellist interjected, 'Hang on, that's her family?'

'"What? They're not married are they?" she asked to which an open-mouthed Stephanie exclaimed: "Yeah... for, like, 10 years."'

Back in the day... Stephanie (left) made the transition from secondary cast member to main character in the reality show which spring a plethora of imitations