Behind the scenes at Kylie Jenner's 18th bash! Khloe Kardashian puckers up to new beau James Harden... as the birthday girl gets her groove on with Caitlyn

Surrounded by her nearest and dearest, Kylie Jenner has been pulling out all the stops in making her 18th birthday a celebration to remember.

But in new pictures released, it appears as if big sister Khloe Kardashian ensured she stole some of the limelight at the star-studded bash, which was held at The Nice Guy in West Hollywood on Sunday night.

The 31-year-old star was seen putting on a loving display with her new boyfriend James Harden, going in a for a huge kiss while the celebrations were kicking off.

Scroll down for video

Behind the scenes: In new pictures released it appears as if Khloe Kardashian ensured she stole some of the limelight at Kylie Jenner's birthday

Behind the scenes: In new pictures released it appears as if Khloe Kardashian ensured she stole some of the limelight at Kylie Jenner's birthday

Celebrate in style with Khloe's sheer stripe dress by Balmain

Wowzers. What a way to show off the 'revenge' body that Khloe Kardashian has been working so hard on!

It was Kylie Jenner's 18th celebrations, but of course her big sisters all made as much effort as the birthday girl. Mesh seemed to be a must on the night, with Kim opting for a sheer high neck top and Kourtney rocking an optical illusion all-in-one. But it was Khloe's killer LBD that really knocked our socks off!

It's by Balmain, the family's favorite designer label. We love the chenille texture, high neck and strategically placed sheer panels. You might have it in your head that horizontal stripes are a no no, but allow Koko to prove you wrong! Click (right) to invest in this super flattering dress now.

Balmain a bit beyond your budget? We know the feeling, so have rounded up some high street options that will do the trick in the edit below. Missguided's $16(!) version is on the money!

* PRICES MAY NOT BE AS ADVERTISED

Dressed in a sexy velvet number with cut-out stripes, the popular TV star certainly cut a stylish figure as she cosied up to her man during the special night.

Although Khloe and James have yet to be officially confirmed as a couple, the two have been getting very cosy of late. 

Meanwhile, birthday girl Kylie – who turned 18 on Monday - sashayed the night away with Caitlyn Jenner in a sparkly tight dress, covered in crystals and sheer panels. 

A family affair: Caitlyn Jenner hit the dancefloor with her daughter Kylie as she joined in the celebrations with the rest of the family

A family affair: Caitlyn Jenner hit the dancefloor with her daughter Kylie as she joined in the celebrations with the rest of the family

Leggy ladies: While the 65-year-old showed off her trim legs in a chic black dress, the birthday girl opted for a sparkly tight number

Leggy ladies: While the 65-year-old showed off her trim legs in a chic black dress, the birthday girl opted for a sparkly tight number

Wearing a platinum blonde wig, the young fashionista highlighted her striking facial features with winged eyeliner, blush-tinted cheeks and a bold pink lip.

The 65-year-old wore an elegant shift dress for the occasion, while studded sandals and a bold red lip gave her stylish look the perfect flourish.

Among the many famous faces at the WeHo celebration were her mother Kris Jenner, 59, and her elder half-sisters Kim, 34, Kourtney, 36, and Kendall, 19 - who followed Kylie's lead in the style department, each decked out in very daring outfits.

Also joining the various members of the Kardashians was Kylie's rumoured boyfriend Tyga, 25, former One Direction singer Zayn Malik, Gigi Hadid and boyfriend Joe Jonas.

Fine dining: The youngest of the Kardashian-Jenner clan enjoyed dinner at The Nice Guy in West Hollywood with her family - pictured (L-R) Kim and Kourtney Kardashian, Caitlyn Jenner, Corey Gamble and mother Kris

Fine dining: The youngest of the Kardashian-Jenner clan enjoyed dinner at The Nice Guy in West Hollywood with her family - pictured (L-R) Kim and Kourtney Kardashian, Caitlyn Jenner, Corey Gamble and mother Kris

Dressed to impress: Khloe, 31, showed off her toned and tanned legs in her velvet number which had sheer stripes running throughout

Dressed to impress: Khloe, 31, showed off her toned and tanned legs in her velvet number which had sheer stripes running throughout

Meanwhile, her older half-sister Kim documented the evening on her Instagram account, sharing snaps of the sisters partying, joking that Kylie was the 'baddest b****h' of all.

There was no sign of reclusive brother Rob Kardashian, who has been lying low over the last year, shunning the spotlight that comes with his family's reality show empire.

According to Us Weekly, Kylie caught a private jet to Mexico with Tyga on Tuesday, and it is believed that sister Kendall, 19 and Hailey Baldwin are travelling there to meet her.

The day after her birthday, the KUWTK star shared an Instagram photo of her brand new $320,000 white Ferrari 482 Italiai – gifted to her by her Rack City hitmaker beau – on the tarmac next to a private plane, along with the caption: ‘GONE’.

Quick change: Later in the evening, Kylie slipped into a sexy black mini dress as she cosied up to Tyga

Quick change: Later in the evening, Kylie slipped into a sexy black mini dress as she cosied up to Tyga

Close pals: Kylie and the 25-year-old rapper were very close at the bash - Tyga was seen giving the reality TV star a helping lift

Close pals: Kylie and the 25-year-old rapper were very close at the bash - Tyga was seen giving the reality TV star a helping lift

Moving on from Lamar: Although Khloe and James have yet to be officially confirmed as a couple, the two have been getting very cosy of late - and the family clearly approve of their closeness

Moving on from Lamar: Although Khloe and James have yet to be officially confirmed as a couple, the two have been getting very cosy of late - and the family clearly approve of their closeness

Having a rave: James, 25, was seen hitting the dancefloor with Khloe's younger sister Kendall Jenner

Having a rave: James, 25, was seen hitting the dancefloor with Khloe's younger sister Kendall Jenner

Feeling merry: Tyga was seen checking out 19-year-old Kendall and Kylie's dance moves as the party continued late into the night

Feeling merry: Tyga was seen checking out 19-year-old Kendall and Kylie's dance moves as the party continued late into the night

The comments below have been moderated in advance.

The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

By posting your comment you agree to our house rules.

Who is this week's top commenter? Find out now