Kylie Jenner flashes her cleavage while partying with her sisters after signing Kourtney up on dating site

Kylie Jenner just signed her older sister Kourtney up on an online dating site so that was one reason to celebrate.

The 18-year-old had something to advertise too as she partied with Khloe, 31, and Kourtney, 37, at Henry's in West Hollywood, California on Friday night.

Kylie enjoyed being the center of attention while flashing her cleavage in a very low-cut white top and shared the fun via Snapchat.

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Something to advertise? Kylie Jenner went partying with her sisters Khloe and Kourtney at Henry's in West Hollywood on Friday night and shared the fun via Snapchat

The youngest of the Kardashian-Jenner clan was seen grooving in a dimly lit nightclub, swaying between her elder siblings with a sly smile on her face.

Khloe moved in for a close up, her long blonde-highlighted hair catching the light of the camera phone.

Coincidentally, Khloe's ex-boyfriend James Harden was also at the club with his entourage, as TMZ reported.

Then Kourtney came into focus while taking a swig from a bottle of beer as the music raged on.

Sister, sister: Kourtney looked a bit woozy while Khloe was having a wild time 

Girls gone wild: Kylie flaunted cleavage in a low-cut top 

Kourtney, who was dressed in a black scoop-necked top and black choker, looked a little woozy in the second video posted by her enterprising little sister.

Earlier in the day, Kylie took the initiative and signed on her elder sibling to the Bumble app dating site, sharing the easy step-by-step process on Snapchat.

Kylie created the profile and hand-picked the photos that she hoped would entice the opposite sex including a snap of Kourtney lounging in a fur-covered chair in just a black corset dress with thigh-high boots.

Guzzle it: Kourtney appeared to be sipping Stella Artois beer 

Fun, fun, fun: Kylie appeared to be having a blast as the music blared on

Kylie felt it was time that mother-of-three Kourtney, 37, who's been single since her split from Scott Disick last July, get out there and mingle.

And the teen entrepreneur, who just broke up with rapper Tyga herself for good or so it seems, obviously had some time on her hands.

Kylie's Snapchat began with her flashing Kourtney's iPhone in her nicely manicured hand.

Matchmaker: Kylie Jenner took charge and signed Kourtney up on the Bumble dating app and shared the easy step-by-step process on Snapchat 

Sexy and to the point: The 18-year-old chose this picture of Kourtney in corset dress and thigh-high boots for the profile  

Come hither look: Kourtney's photo - which was taken in April - will certainly lure the bees on Bumble

'I have Kourtney's phone': Kylie said, 'I know her password. Should I go through her text messages and read them to you guys?'

Bright idea: Like a light bulb going on, sly and catlike Kylie said, 'I think she needs to be on Bumble'

'I have Kourtney's phone, I know her password. Should I go through her text messages and read them to you guys?' she asked.

'So, I think she's gonna kill me if I read her text messages, so I think I think I'm gonna set her up for Bumble,' Kylie eventually decided, adding: 'I think she needs to be on Bumble.'

Like Tinder, Bubble is an app that enables people to communicate by swiping right and adding each other to their 'hive' of connections.

See the resemblance? Kylie included a picture of Wednesday from The Addams Family as Kourtney's wallpaper along with the quote, 'I hate everything'

It's in the profile: Kourtney's age and alma mater were included in her profile

Silly selfie: Kylie included a photo of Kourtney making a silly face for a bathroom selfie

The woman has to make the first move and say something within 24 hours or she loses the connection.

Showing off her matchmaking skills, Kylie switched on Kourtney's phone showing a picture of Wednesday from The Addams Family as her wallpaper along with the quote, 'I hate everything.'

Kourtney's new profile followed: 'Kourtney Kardashian, 37,' along with education (the University of Arizona) and year she graduated (2001).

That was fun: Kylie appeared to be admiring her handiwork

Big sister approves: Kourtney wasn't mad at Kylie for meddling in her love life, telling E! News: 'That's what sisters do' and added she liked Bumble because 'the women are in charge' 

Kylie was seen speaking to her sister in her nonchalant way, 'Hey Kourtney.'

'Did you take my phone?' Kourtney wanted to know, to which Kylie replied, 'I set you up for a dating profile.'

'What? Wait, what is this? These are the photos you picked?'

Besides the one of Kourtney relaxing in the furry armchair, which was taken in April, photos included the single mom in bathroom selfie mode and clad in lacy top and lounging trousers.

Ex factor: Kourtney's former fiance and the father of her three children, Scott Disick, has moved on and started dating other women; he was pictured January 16

Although she's maintained she hates to date, Kourtney wasn't mad at Kylie for meddling in her life life and fixing her up on the female-driven Bumble dating app.

'That's what sisters do,' Kourtney told E! News. 'But it's cool that the women are in charge. It's a great idea.'

Kourtney's main focus of late has been raising her three children, Mason, six, Penelope, three, and Reign, one, and helping her ex Scott Disick to stay on the straight and sober path.

Disick, meanwhile, has been linked to Swedish model Lina Sandberg, 32, and has recently been spending time with another model, Christine Burke, 20.