The family were mobbed by excited fans as they posed for photographers at The Mirage Hotel.
It's a family affair: The Kardashian clan pose in Las Vegas at the opening of the Khaos store today, including Scott Disick, Rob Kardashian, Kim, Kourtney, Khloe, Kylie Jenner, matriarch Kris and Kendall
Pushing against a crowd barrier, the audience shouted, cheered and took pictures of the reality stars, with some asking the sisters to autograph their latest book, Kardashian Konfidential.
Cameras at the ready: Kim Kardashian looks a little overwhelmed as she steps out wearing the same leopardskin dress she sported earlier in the day
Mob scenes: Kourtney Kardashian smiles broadly as she poses with eager fans for pictures
Crowd rush: The crowd surged forward to catch a glimpse of Khloe Kardashian, who happily poses for one pleased fan
Pregnant Khloe, 32, chose a loose black mini dress with sheer sleeves while her younger sister Kourtney wore a clinging black and sequinned number, complete with ornate black heels.
But family matriarch Kris Jenner managed to out-glam all her eldest daughters in a long sleeved sequinned number.
Glamming up: The reality show stars looked stunning in their outfits, with Kim sporting leopardskin, Kourtney in a loose black dress and Khloe and Kris Jenner also sporting black
Back to reality: The sisters and family matriarch Kris Jenner all looked thrilled at the big turn out for their big launch
A walk on the wild side: Kim sported the same clingy leopardskin dress she wore earlier today when she and her sisters jetted in to Las Vegas by private jet
She teamed the outfit with the same towering wedge heels and wide leather belt.
And after filing for divorce from husband Kris Humphries after just 72 days of marriage, her wedding ring was also conspicuously absent from her hand.
She seemed happy and relaxed, despite making her first official public appearance since the split.
Pregnancy glow: Kourtney looked stunning in her loose fitting outfit which she teamed with bright red lipstick
Let's talk shop: The three sisters conducted TV interviews together to plug their latest business venture
Happy and relaxed: Kourtney and Khloe seemed thrilled to be attending the launch of the shop, which will sell 'one of a kind' items
A website post by Kim today revealed her excitement at the shop, the latest in a number of stores the sisters have opened across the globe.
'When I was young, my dad would pile all the kids into the car and take us to The Mirage in Las Vegas to see the white tigers!' she wrote.
I never in my life dreamed that one day my sisters, my mom and I would have our first ‘celebrity lifestyle’ boutique there!
Pure professionals: The youngest daughters of Kris Jenner were clearly enjoying themselves as they conducted interviews on the red carpet
Signing up: Kylie Jenner, 14, autographed the latest Kardashian book Kardashian Konfidential
Lights, camera, action: The teenage sisters looked more than happy in front of the gang of photographers
'I can’t wait for you all to come and see it. I think you’ll love it!' she continued, posting up several pictures of the store on her page.
A press release on the opening of the store revealed that the shop will sell a variety of 'one of a kind' items all designed by Kim, Khloe, Kris and Kourtney' according to the press release.
Teenage dreams: Kendall Jenner, 16 and her younger sister Kylie, 14, both looked older than their years in mini dresses and heels
Fan love: Teenage reality stars Kendall and Kylie took the fan adoration in their stride
Model pose: Kendall and Kylie posed for photographs by their pictures which are posted on the outside of the new store
The boutique will offer a variety of items including T-shirts, novelty gambling chips, a surprise beach towel, playing cards, private label make-up by Stila, individually designed scented candles from each girl.'
And in a joint statement, the girls said: 'We're thrilled to have the opportunity to share some of our favourite products and even one-of-a-kind items with our fans.'
Meanwhile, the trio's younger half sisters also managed to get in on the act, with 16-year-old budding model Kendall wearing a blue mini dress, and Kylie, 14 sporting a grey and white sequinned number.
Who's next: Scott Disick looked suave in a dark suit and grey tie as he chatted to his largely female audience
Off the dancefloor: Rob Kardashian had plenty of female fans clamouring for his signature at the event
The teenagers seemed to take the fan's attention in their stride, happily chatting to fans and signing autographs.
It is something they may have to get used to, if recent reports that they are getting their own spin-off reality show are anything to go by.
At one point, they even posed alongside photographs of themselves which are posted outside the store.
Family pose: The Kardashian and Jenner clans were out in force to promote the new 'celebrity' store
Rob Kardashian has also clearly won a lot of female admirers from his recent successful appearance on Dancing with the Stars as he signed autographs for young fans.
And the family seemed happy at how the night went, with Khloe Kardashian tweeting: 'Wow! Tonight was amazing!!!! Thank you to everyone who came out to @KardashianKhaos this was an amazing night!!!!'
Promoting the brand: The family coined in a whopping $65 million last year according to estimates
Business venture: Kardashian Khaos will officially open tonight at the Las Vegas Mirage Hotel