PICTURE EXCLUSIVE Kourtney Kardashian, 37, wears a sheer bra for late-night rendezvous with former flame Justin Bieber, 22

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She'd spent Friday night freaking out after her baby daddy Scott Disick went missing on a night out with her sister Kim in Dubai.

But with the drama resolved it was time for Kourtney Kardashian to enjoy herself on Saturday.

And the reality star didn't fail to let her hair down, flinging open her jacket to reveal her shapely figure in a sheer bra as she enjoyed a late-night rendezvous with former flame Justin Bieber.

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Back on? Kourtney Kardashian appeared to rekindle her rumoured romance with Justin Bieber at West Hollywood hotspot The Peppermint Club on Saturday night

En garde! As usual, the KUWTK reality star - who was last linked to Next Model Younes Bendjima - sported full contouring make-up applied by her bestie, Joyce Bonelli 

At 22, the former child star is 15 years the junior of the mother-of-three. But the onetime neighbours still seem to have plenty in common, not least their bumpy romantic histories.

On Friday, Kourtney's 33-year-old ex reportedly 'went MIA' during his trip to Dubai with her younger sister Kim.

'No one knew where he was at. He was supposed to be there to watch over Kim, but no one could find him,' a source told Radar Online of Disick.

See through: Kourtney - who relies on stylist Monica Rose - flashed her nipples and her abs in a black lace bustier over unbuttoned matching silk pyjamas and marabou heels

And Justin addressed the rumours in 2015, telling The Bert Show: 'I’m being used, man. What can I say?...No, no, but for real, she’s great. I've known [the family] for years'

'Kourtney flipped out and when she finally got Scott on the phone, he told her that she has trust issues.' Infuriated she promptly tweeted: 'I've got trust issues. 

 As for Justin, he remained tight-lipped when TMZ asked him about his ex-girlfriend Selena Gomez's new boyfriend The Weeknd. 

Kourtney caught up with Justin at West Hollywood hotspot The Peppermint Club on Saturday night.  

Former flames: At 37, the single mother-of-three is 15 years older than the Canadian crooner

Thick as thieves: The May-December duo were neighbors in the gated community The Oaks of Calabasas before the egg-tossing pop star sold his $7.2M six-bedroom mansion to her sister Khloé in 2014

Rolled out of bed: The half-Armenian socialite finished off her boudoir-inspired ensemble with a sleek ponytail and a red Louis Vuitton rucksack

Kourtney - who relies on stylist Monica Rose - flashed her nipples and her abs in a black lace bustier over unbuttoned matching silk pyjamas and marabou heels.

The half-Armenian socialite finished off her boudoir-inspired ensemble with a sleek ponytail and a red Louis Vuitton rucksack.

Kardashian was dressed for Cash Warren's 38th birthday 'Pajama jammy jam,' which had taken place in Beverly Hills earlier.

As usual, the KUWTK reality star - who was last linked to Next Model Younes Bendjima - sported full contouring make-up applied by her bestie, Joyce Bonelli.

To-go drink: Meanwhile, Justin was dressed way down in a chambray baseball cap, grey Supreme hoodie, matching trainers, and ripped skinny jeans

Shotgun! Earlier, Bieber hung out with his pop protégé Madison Beer and Patrick Schwarzenegger at the nearby celeb favourite, Catch LA

Brawny bodyguard: The Grammy winner had no comment when TMZ asked him about his ex-girlfriend Selena Gomez's new boyfriend The Weeknd

Meanwhile, Justin was dressed way down in a chambray baseball cap, grey Supreme hoodie, matching trainers, and ripped skinny jeans.

Earlier, Bieber hung out with his pop protégé Madison Beer and Patrick Schwarzenegger at the nearby celeb favourite, Catch LA. 

Kourtney's late night rendezvous with the tattoo-sleeved millennial came after several sporadic sightings dating back to August 2015.

A year ago, the University of Arizona grad coyly admitted 'We're friends, yes' on The Ellen DeGeneres Show. 

Fling or friends? Kourtney's late night rendezvous with the tattoo-sleeved millennial came after several sporadic sightings dating back to August 2015

And Justin addressed the rumours in 2015, telling The Bert Show: 'I’m being used, man. What can I say?...No, no, but for real, she’s great. I've known [the family] for years.'

The Let Me Love You singer recently scored Grammy Award nominations for album of the year, best pop vocal album, and song of the year.

But after declaring awards shows 'fake' and 'hollow' in a May 23 Instagram post, Bieber might skip the February 12 ceremony all together. 

Sly reply: A year ago, the University of Arizona grad coyly admitted 'We're friends, yes' on The Ellen DeGeneres Show

'I don't feel good when I'm there nor after,' the Calvin Klein underwear model confessed at the time.

'These award shows seem so hollow. I get the premise is to award people for their accomplishments, but is it really? Because when I look in the audience I see a bunch of fake smiles so that when the camera hits them they look happy.'

Justin will then resume his 153-date, $139M-grossing Purpose World Tour on February 15 at Mexico's Estadio BBVA Bancomer. 

Meanwhile, Kardashian keeps busy raising her three children - son Mason, 7; Penelope, 4; and son Reign, 2 - with ex-partner Scott Disick.  

Home to the dog house? Scott Disick arrived home from Dubai on Sunday, looking solemn at LAX, after Kourtney spent Saturday night out in Los Angeles with Justin 

Amicable exes: Meanwhile, Kardashian keeps busy raising her three children - son Mason, 7; Penelope, 4; and son Reign, 2 - with ex- partner Scott Disick

'No one knew where he was': On Friday, Kourtney's 33-year-old babydaddy (L) reportedly 'went MIA' during his trip to Dubai with her younger sister Kim (R)

Racy attire:The raven-haired beauty ended her nine-year on/off relationship with Scott after he was caught canoodling with stylist Chloé Bartoli in 2015