Kylie Jenner flashes her cleavage while celebrating 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 motivation to celebrate.

The 18-year-old had something to advertise too as she celebrated 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.

Khloe moved in for a close up, her long blonde-highlighted hair getting 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.

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 made 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.

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 blend. 

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 started with her blazing Kourtney's iPhone in her pleasantly manicured hand.

'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.

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.