Kylie Jenner and Kourtney Kardashian str*p down for cosmetics line

Kylie Jenner and Kourtney Kardashian st*ip down for cosmetics line

On Wednesday, Kourtney Kardashian's 39th birthday was marked with a flurry of gushing tributes from friends, family and fans alike. 

Yet aside from the loving notes, her half-sister Kylie Jenner used the big day to announce she would be collaborating with the birthday girl for the latest in her cosmetics line - KOURT X KYLIE, complete with three eyeshadows and three lipkits.

Taking to Instagram and her website on Wednesday, new mum Kylie, 20, posted a sizzling promotional snap with her sibling as they both wowed in nude lingerie before taking to her stories to share glimpses of what fans can expect from the line.

As ever the Kardashian clan are at the centre of headlines, this time due to the fact sister Khloe has just given birthday to her first child, a daughter named True, in the midst of a cheating scandal surrounding her beau Tristan Thompson. 

Never ones to miss a moment in the spotlight, Kylie used her half-sister's birthday to unveil the latest addition to her wildly successful cosmetics line, which sprung from her Kylie Lip Kits before branching out. 

In June last year, Kylie, who launched her lip kits in 2015, also collaborated with Khloe for two new cosmetics sets - branded the KoKo collection.

To ensure all eyes were on her and Kourtney, the stunning star smouldered in the promo shots as she wowed in the one-piece which made the most of her frame

Having given birth to her first child earlier this year, fans were naturally breath-taken by the stunning snaps which saw the sister put on equally sexy displays. 

She added a caption on the shot reading: HAPPY BIRTHDAY TO THE QUEEN! so excited to announce the KOURT X KYLIE collaboration...

'this collection gives me so much lifeeeee! 3 mini palettes & 3 of Kourtney’s signature lippies launching 4/24! collaborating with you was so much fun! I love you!

Check out my stories to see our collab @kyliecosmetics p.s. we are both wearing one of her new shades RAD in this pic!'

Kourtney meanwhile posted a solo snap from the shoot, with the caption: 'KOURT X KYLIE 4/24 I am so excited to announce my collaboration with @kyliejenner...

'We have been working on this for a year...3 mini eyeshadow palettes and 3 lips..I am wearing Matcha on my eyes and RAD on my lips. Happy Birthday to me!'